跟讀練習: MinuteCement - LC3 - 通過影片學習英語口語
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56 句
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In 2012, 3 .6 billion tons of cement were produced worldwide.
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That amount is more than all the food produced for human consumption that same year.
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We mixed most of the cement with about 22 billion tons of aggregates and 2 .5 billion tons of water.
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This makes concrete the product most consumed by humans.
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We use it to build homes, bridges and other infrastructure we use every day.
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The reasons concrete is so popular is because it is cheap, made of widely available materials and easy to use.
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But the global demand for concrete requires huge amounts of resources.
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And we are going to need even more.
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By 2050, the cement consumption is expected to double.
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Look at how China alone is already consuming more cement than the whole world in 1990, and how India's cement production has doubled over the past 10 years.
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It will be a real challenge to meet the projected demand.
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Compared to many other materials, producing cement is very ecological.
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But with several brilliant tons produced each year, the cement industry is a major contributor to global CO2 emissions.
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Where does it come from exactly?
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To manufacture cement, limestone and clay are heated together in a large kiln at about 1450 degrees Celsius.
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This produces an intermediate material called clinker, which is rapidly cooled, mixed together with gypsum and ground to make cement.
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40 % of CO2 emissions come from burning the fuels needed for the kiln.
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The efficiency of this manufacturing process is already optimized in most modern cement plants.
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But we can act on the 60 remaining percent of CO2 emissions, which come straight from the decomposition of the limestone.
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How, you ask?
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We can substitute part of this clinker by less CO2 -intensive materials, called supplementary cementitious materials.
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We often throw in waste materials from other industries.
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For example, blast furnace slag from steel plants or fly ashes from coal -fired power plants.
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What you get is a blended cement.
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Sadly, there are not enough substitute materials for everyone.
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So what other substitutes can we use?
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When calcined at a temperature of only 800 degrees Celsius, clay becomes reactive and can be used as a replacement material.
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We can also add limestone without any heating.
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Simply grind it and voila!
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We know how to use them separately, but if we add both of them to clinker, there is a synergy between the components and you get a perfectly good cement even with high additions.
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This is where LC3 comes in.
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LC3 stands for Limestone Calcined Clay Cement.
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It is a special blend composed of 50 % clinker, 30 % calcined clay and 15 % ground limestone.
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With 50 % of replacement, we can double the production of cement with the same amount of clinker better yet we can use limestone
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and clay of lower grade normally discarded by industries no precious agricultural soil
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or topsoil will be used also clays are abundantly available in
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regions where the highest cement consumption is expected LC3 aims to
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provide local solutions to the global demand this new material is
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very attractive is it sure it is low carbon up to
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50 % of the clinker can be substituted the limestone doesn't need to be heated
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and the clay is activated at low temperature.
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It is low cost.
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Cheap, low -grade materials can be used.
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Limestone and clay are widely available from existing quarries and easily extracted, within the first 5 meters of the earth's crust.
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It is low capital.
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Increasing production with LC3 requires less investment than adding a new production line.
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Simply adapt an existing kiln or buy a cheap one for the clay.
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And the best part is, LC3 is easy to use.
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You can replace a normal cement bag by a LC3 bag.
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You get the same handling, same procedure.
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Before LC3 can be mass produced, it needs to be certified according to industry standards.
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This is why LC3 has become a large -scale project, with scientific partners in Switzerland,
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India and Cuba, many industrial partners around the globe and the support of the SDC.
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Given the great advantages of LC3, we have the full support from the industry to show it's easy handling, its easy casting, its strength and its durability.
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As a group, we are all working full speed to make cement more sustainable.
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And as always, thanks for watching!
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背景與情境
這段影片圍繞“LC3”這種低碳水泥展開，內容涉及全球水泥生產現狀、環境影響及創新解決方案。對話邏輯清晰，涵蓋資料、原理與應用，適合英語學習者練習說明性文本的理解與表達。其中大量專業術語與長句，能有效提升聽力與口語的複雜度應對能力。
日常交流高頻短語5則
- be a major contributor to：是……的主要促成因素。例：The cement industry is a major contributor to global CO2 emissions.
- substitute...by...：用……替代……。例：We can substitute part of this clinker by less CO2 intensive materials.
- voilà：（法語）瞧，這就行了。例：Simply grind it and voilà!
- synergy between...and...：……與……之間的協同作用。例：There is a synergy between the components.
- aim to：旨在……。例：LC3 aims to provide local solutions to the global demand.
影子跟讀分步指南
針對影片的說明性風格，可通過以下步驟提升口語與發音：
1. 逐句拆解：先將長句按意群分割，如“To manufacture cement, limestone and clay are heated together in a large kiln at about 1450 °C”，可拆為“To manufacture cement / limestone and clay are heated together / in a large kiln / at about 1450 °C”，逐一跟讀，重點練習提高英語發音的準確性。
2. 模仿語調：注意資料與原理部分的降調，如“3.6 billion tonnes”“1450 °C”，及疑問句的升調，如“How? You ask?”，通過影子跟讀（shadowing）強化語調把控。
3. 提速訓練：使用shadowspeak技巧，先以原速50%跟讀，逐漸提升至100%，適應影片的語速節奏。
4. 實戰應用：將短語融入雅思口語練習，如描述“環保材料”時用“substitute...by...”“synergy between...and...”，增強表達豐富性。
5. 藉助工具：利用shadowing site反覆精聽，對比自身發音與原音差異，針對性改進。
堅持按此方法練習，可有效提升英語聽說能力，應對複雜文本與交流場景。
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 |
|---|---|
| 被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的 | were produced · is expected · are heated |
| 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 | has doubled · has become |
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。