跟讀練習: Introduction 1, Context - 通過影片學習英語口語
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Cement Chemistry for Sustainable Cementia Materials Hello and welcome to this series on Cement Chemistry for Sustainable Cementia Materials.
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In this series of modules, we're going to look at the cement chemistry and how this helps us to understand the sustainability of these very important materials.
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Most of the modules should be really understandable to anybody with a fairly basic knowledge of high school chemistry.
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So in this first module, we're going to look at the overall context.
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We're going to look at the role of cementitious material in the world today
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and what are the origins of their CO2 footprint.
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Now, in this first slide, we can see the overwhelming dominance of cementitious materials.
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They make up between 30 to 50 percent of everything we produce,
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probably about 50 percent of solid materials and 30 percent if we include things like fossil fuels.
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And in the light of that, the fact that they're responsible for CO2 emissions of around 5 to 10 percent is a very good ratio.
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But more importantly, we can really see
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that it would in no way be possible to replace semantitious materials with alternatives at any meaningful level.
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For example, if we look at the amount of wood produced worldwide, this is between 10 and 15% the amount of cementitious materials.
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And already it's estimated that this amount of wood is beyond the limits of sustainability.
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That's to say we're cutting down more trees than we're planting.
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So while this may be a nice option in Europe and North America, it's really not practical for the many people who need to be housed in countries like China,
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India, Africa, South America.
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This slide here really shows how the environmental footprint of concrete is very low.
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And we should talk about concrete because concrete is the final material we really use.
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Cement is the precursor and there's roughly about 10% of cement in concrete.
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On the right here, I've normalized these figures compared to the highest, which is aluminium.
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You can see very vividly just how much energy and CO2 you can save by recycling aluminium.
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And I hope after seeing this, you don't throw your Coke can in the bin anymore.
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But concrete is really extremely low, lower than almost all other materials.
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Of course, this is just on a weight basis.
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When you put this into a structure, it becomes more complicated.
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We're not going to go into that here, but generally, even in that situation,
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concrete still comes out very strongly as an environmentally friendly material.
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The amount of cement we're using has increased very, very dramatically in the past few decades.
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Since 1950, the population has increased about threefold, and in the same period,
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the amount of cement we use has increased by about 34 times.
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In recent decades, this has really been driven by the development in China.
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And we should not view this negatively because this development has lifted a lot of people out of poverty.
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It's provided them with decent homes, with roads, railways to get around and everything like that.
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But we certainly cannot imagine that this growth in demand for cement is going to slow down because there are many,
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many other parts of the world where people still haven't had decent housing or transportation systems.
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Finally, what we do with our lives and the CO2 produced is a question of choices.
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And here again, you know, if we decide to build a house, we make maybe a house for a family of three people,
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this will typically take about 10 to 20 tons of cement and last for about 50 years.
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So we can calculate from that
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that the CO2 to do with your materials in your house is about 12 kilograms a month.
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Now, if you're driving a car, which you almost certainly are,
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that same family of three will probably drive at least 10,000 kilometers a year.
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And then they'll be consuming fossil fuels, which will be producing about 90 kilograms of CO2 per year,
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seven or eight times more than the materials in their house.
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But we should also reflect on our other choices in life, for example, the food we eat.
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Here you can see for a very meat intensive diet,
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the associated CO2 production would be around five to seven kilograms of CO2 per day.
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whereas a vegetarian diet is much lower at around 3 to 4 kilograms of CO2 per day.
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And so if we calculate for the same imaginary family of three that they went from eating meat to being vegetarian
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maybe for just two
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or three days a month this would be equivalent to saving all the CO2 that they needed to build their house.
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So rather than just blaming the producers of these materials we have to think about what we're doing in our lives
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and what we choose to do that produces CO2.
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Okay, there's no reason for complacency because if we did nothing about the CO2 footprint of cementitious materials,
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we could end up in a situation like this.
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Here we see the blue line is the trajectory
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that has been estimated we should try to meet if we're to restrict global warming to this two degrees temperature rise.
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Whether we're going to do that or not is another question, but that's the trajectory of overall global emissions if we're going to do that.
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If we achieve that blue line and we did nothing about cement,
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then the emissions from the production of cement and cementitious materials would follow the red line.
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And we see
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that by 2050 we would end up in a situation where
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cementitious materials would be responsible for something like 30% of world CO2 emissions, which is clearly unacceptable.
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So where is the consumption of cement taking place?
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What we see here is the distribution of cement use around the world.
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And only about 10% of cement use is taking place in OECD countries.
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And in these countries, it's forecast that demand will really stay pretty much constant.
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More than 90% of consumption is taking part in the developing world,
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particularly in China, which has been very dominant over the past two decades.
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It's been estimated in the last three years, China produced more concrete than was produced in the whole of North America in the 20th century.
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and many other countries like India in particular are looking to follow this development path to provide decent houses for their people,
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decent rail systems, decent road systems and this will inevitably mean that the growth in use of cement is going to increase.
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So if we're going to meet this challenge of the growing demand for cement we need solutions
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which are first of all practical, They can be used by unskilled workers.
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And, you know, this shows you the kind of typical situation you can have for mixing concrete.
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The example is from India.
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And also economically.
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Now, you know, cement is an incredibly cheap material.
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In most of Europe, you can buy a ton of cement for less than 100 euros for a whole ton.
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In many developing countries, though, the prices are actually higher, even though the incomes are lower.
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So it's very important that we have solutions
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which are really economically viable for these countries where there's this huge need for building infrastructure and housing,
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etc. So let's look at where these CO2 emissions are coming from.
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Unlike most other industrial processes, only a minority of the CO2 emissions are coming from the energy consumption.
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Producing cement is a high temperature process.
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you're going up to temperatures of 1450 or so and this does take energy but it's still the minor amount.
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A cement kiln as we see here looks like a fairly unsophisticated type of instrument.
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But this is in fact not true
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because in the past few decades there's been very dramatic improvement in the amount of energy needed to produce cement.
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And in really state-of-the-art equipment now the production process is highly optimized up to nearly 80% of the thermodynamic limit
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which is those of you who or study thermodynamics will know, is very close to the maximum you can achieve.
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Another factor which is important is that rather than using fossil fuels, which used to be the dominant means in the past,
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nowadays we can use a wide variety of waste fuels.
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So for example, off cuts from producing furniture,
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old car tires, Many, many different kind of waste can be burnt in a cement kiln.
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And in many parts of Europe, plants are using more than 80% of waste fuels.
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So this is a very efficient tool for valorizing waste materials.
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So if we're going to make improvements, we need to turn to the other side, to the 60% of the equation.
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And this 60%, this comes from the breakdown of calcium carbonate into calcium oxide and CO2.
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Calcium carbonate, this is in fact limestone, which is 80% of the raw material used to make cement.
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Now, the fact we have this chemical CO2 means that if we're going to reduce this, then we're going to have,
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this has implications for the chemistry of the cement.
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And that means it has implications for the whole way it behaves, in use, etc., etc., which of course is a big challenge.
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So what have we seen in this lecture?
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Well, we've seen how important semantitious materials are, how they make up by far the overwhelming majority of all the materials we used
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and therefore cannot be replaced by other materials.
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We've seen that in fact the environmental footprint from these materials is in fact quite low
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and we've looked at where the CO2 emissions come from
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and we've seen that most of the CO2 emissions come from the chemical breakdown of limestone,
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that's calcium carbonate, and therefore we can't really imagine to do much about CO2 emissions by, for example, looking at alternative energies.
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So in the next lecture, we're going to go into more detail about why the chemistry of cement is as it is.
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So I look forward to seeing you next time and I hope you've enjoyed this first module.
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If you want to find out more, then this publication, Ecoefficient Cements, which we published in November 2016,
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gives you a very good background to all the aspects I will tackle in this first module.
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本課的詞彙與口語要點
這節 C1 級別的口語課以影片“Introduction 1, Context”為素材。 影片中反覆出現的詞有：cement, material, emissions, concrete, amount。 這段影片共有 115 個句子、1706 個單詞可供跟讀。 講話部分時長為 11:57。 說話人語速平穩，每分鐘約 143 個詞，很適合跟讀。 86% 的單詞屬於英語最常用的 3,000 詞，其餘的詞建議在練習前先學一下。
影片中的重點詞彙
影片中最難的 15 個單詞，附發音和釋義：
| 單詞 | 發音 | 釋義 |
|---|---|---|
| cement 名詞 | /səˈmɛnt/ | 水泥, 洋灰 |
| emission 名詞 | /ɪˈmɪʃ.ən/ | 排放 |
| module 名詞 | /ˈmɑd͡ʒul/ | 模組 /模組 |
| kilogram 名詞 | /ˈkɪləɡɹæm/ | 千克, 公斤 |
| footprint 名詞 | /ˈfʊtpɹɪnt/ | 腳印 /腳印, 足印 |
| calcium 名詞 | /ˈkælsi.əm/ | 鈣 /鈣 |
| carbonate 名詞 | /ˈkɑɹbəneɪt/ | 碳酸鹽 /碳酸鹽 |
| fossil 名詞 | /ˈfɑsl̩/ | 化石 |
| kiln 名詞 | /kɪln/ | 窯 /窯 |
| overwhelm 動詞 | /ˌoʊ.vɚˈwɛlm/ | 吞沒 /吞沒 |
| trajectory 名詞 | /tɹəˈd͡ʒɛktəɹi/ | 軌道 /軌道, 彈道 /彈道 |
| aluminium 名詞 | /ˌæl.(j)uˈmɪn.i.əm/ | 鋁 /鋁, 鋼種 /鋼種 |
| limestone 名詞 | /ˈlaɪmˌstoʊn/ | 石灰岩, 灰巖 |
| vegetarian 名詞 | /vɛ.d͡ʒɪˈtɛ.ɹi.ən/ | 素食主義者 /素食主義者, 素食者 |
| calculate 動詞 | /ˈkælkjʊleɪt/ | 計算 /計算, 算 |
影片中出現的短語動詞
| 單詞 | 發音 | 釋義 |
|---|---|---|
| make up 動詞 | /ˌmeɪk ˈʌp/ | 組成 /組成 |
| come out 動詞 | /ˌkʌm ˈaʊt/ | 出, 出來 /出來 |
| cut down 動詞 | 砍倒 | |
| find out 動詞 | 找出, 查明 | |
| look forward to 動詞 | 期待, 嚮往 | |
| slow down 動詞 | 減速 /減速, 放慢 |
影片中的語法
說話人最常用的結構，並附上影片中的原話：
| 結構 | 影片中的用法 |
|---|---|
| 現在完成時 have/has + 過去分詞 — 過去發生但與現在仍有關聯的事 | I've normalized · has increased · has really been driven |
| 定語從句 who / which + 從句 — 補充說明人或事物 | people who need · highest, which is · fuels, which will |
| 被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的 | be housed · been driven · has been estimated |
需要注意的發音
說話人用了 29 次縮略和弱讀形式，例如 we're, we've, you're。請按聽到的簡短形式來說。
- “th” 音: thermodynamic /ˌθɝmoʊdaɪˈnæmɪk/, thermodynamics /ˌθɜː(ɹ)moʊdaɪˈnæmɪks/
- “sh” 和 “zh” 音: emission /ɪˈmɪʃ.ən/, cementitious /ˌsɛmɛnˈtɪʃəs/, implication /ˌɪmpləˈkeɪʃən/, equation /ɪˈkweɪ.ʒən/
- 長單詞——注意重音位置: cementitious /ˌsɛmɛnˈtɪʃəs/, implication /ˌɪmpləˈkeɪʃən/, trajectory /tɹəˈd͡ʒɛktəɹi/, aluminium /ˌæl.(j)uˈmɪn.i.əm/, sustainability /səˌsteɪnəˈbɪlɪti/
中文母語者容易讀錯的音：
- /v/ — 不要讀成 /w/，上齒輕觸下唇: overwhelm /ˌoʊ.vɚˈwɛlm/, vegetarian /vɛ.d͡ʒɪˈtɛ.ɹi.ən/, valorize /ˈvæləˌraɪz/, vividly /ˈvɪvɪdli/, inevitably /ɪˈnɛvɪtəbli/
- 詞尾子音 — 要讀清楚，後面不要加母音: cement /səˈmɛnt/, cementitious /ˌsɛmɛnˈtɪʃəs/, footprint /ˈfʊtpɹɪnt/, carbonate /ˈkɑɹbəneɪt/, calculate /ˈkælkjʊleɪt/
- /r/ 和 /l/ 的區別: kilogram /ˈkɪləɡɹæm/, recycle /ɹəˈsaɪkəl/, valorize /ˈvæləˌraɪz/, importantly /ɪmˈpɔɹ.tənt.li/
如何用這段影片練習
- 先完整聽一遍影片，不要開口，記下不認識的單詞。
- 用正常速度逐句跟讀，每句重複到你的節奏與說話人一致為止。
- 錄下自己的聲音並與原聲對比，特別注意 cement, emission, module 這類單詞。
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。