Luyện nói tiếng Anh bằng Shadowing qua video: How to fix clean energy’s storage problem
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72 câu
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1
This is the typical demand for electricity on a spring day in California.
2
It starts growing around 6 a .m., then rises again around 6 p .m.
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Now, this line shows when wind power feeds the California power grid.
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Wind is variable, but often picks up at night.
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Solar panels, on the other hand, kick into gear around 7 a .m., generate a lot of electricity until the sun sets around 7 p .m.
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On most days, neither comes close to meeting the peak demands of the day.
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So, the power company relies on fossil fuels, like natural gas, to make up for the gap, which widens significantly when people use electricity the most.
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Since the power company can't store the solar and wind energy, it has to use fossil fuels at these times,
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which can be stored in barrels and tanks.
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It's kind of the big gap in our renewable energy system right now.
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If we don't figure out a way to store renewable energy, there's a chance that we're going to be still dependent on fossil fuels.
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So, how do we store some of this solar and wind energy for later?
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Right now you might be thinking, just use a battery.
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And you're not wrong.
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Batteries have improved immensely over the past few years, particularly lithium -ion batteries, which use a chemical reaction to store energy.
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Individual homes that have solar panels often use lithium -ion batteries to store energy.
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But there's a few reasons lithium -ion isn't perfect for the grid.
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This is Neil Dinesha, a founding writer at Heatmap, a climate news site, and he wrote about this for Vox in 2022.
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One is just the scale that's needed.
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We would need a lot at a level that we just don't really have right now.
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That's a challenge because lithium is only found in a few places on earth.
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But more importantly, like we need lithium -ion batteries for other things.
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Lithium -ion battery is really good for stuff that moves because it's relatively light.
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Meaning it's better suited for things like electric cars and portable electronics, not power grids that stay still.
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Luckily, there's another energy storage solution that's actually been around for a long time.
26
This is the site for the first pump storage hydroelectric station in Southern Ireland.
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This is a type of energy storage called pump storage hydro.
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They were first built in Europe.
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The U .S built one in 1929.
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And many more were built in the 1970s and 80s as a way to store nuclear power.
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Today, these facilities are all over the world.
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There are 39 of them in the U .S.
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And they store energy in a really fascinating yet simple way.
34
When energy demand is low,
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renewable or fossil fuel energy is used to pump water from a reservoir or river up a mountain into a higher reservoir.
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Basically converting this energy into what's called potential energy.
37
So potential energy, you might kind of remember from high school physics.
38
When a thing is up at a height, it has stored potential energy.
39
When it's let go, it turns into kinetic energy.
40
When that energy is needed, the water is released down the mountain,
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where it's converted into kinetic energy that spins a turbine and generates electricity for the grid.
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It's a way of combining water, a mountain, and gravity into a battery, and it can be about 90 % efficient,
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meaning only 10 % of this energy is lost in the process.
44
Pump storage hydro works really well, but it's difficult to build more.
45
Well, for starters, you need a mountain, and you need to haul out a mountain to put pumps inside it,
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and it takes a lot of money, and we don't have mountains everywhere.
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So the ideal way to store renewable energy would be something that's cheaper and smaller than a pump storage hydro plant,
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but works in roughly the same way.
49
One company, Energy Vault, is also using gravity to store renewable energy, but without the water or mountain.
50
Instead, renewable energy is used to lift heavy blocks of concrete up into the air, where it becomes potential energy.
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Then when it's needed, the blocks are released, spinning a turbine, which converts the potential energy back into electricity.
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Energy Vault calls this gravity energy storage, and while it's still being tested, the company claims it could be more than 80 % efficient.
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A company called QuidNet is working on a different version of the same principle.
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Their geomechanical pump storage unit uses renewable energy to pump water underground into a pressurized hole, where it can be stored as potential energy,
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then released back up to the surface to spin a turbine and generate electricity.
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Both techniques are betting on potential energy as a solution for storing renewable energy for the grid.
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I think this partly because potential energy has shown itself to be pretty efficient.
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Also, realistically, fewer moving parts.
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If all you're doing basically is using gravity to work with you, you have a pretty massive force of nature on your side right there.
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But potential energy isn't the only possible solution.
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Other companies are using renewable energy to superheat salt, insulating it, then releasing that heat to create steam or hot air to drive a turbine.
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Basically storing renewables by converting them to thermal energy.
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Then there's a company that's betting on rusted iron.
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They're called iron air batteries and what they do is they utilize the chemical reaction
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that creates rust to store and discharge energy.
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This thing
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that we all sort of think of as an inconvenience could be really useful is just kind of beautiful to me.
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Right now these ideas are all in various stages of development, but they are attracting investors.
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And the hope is that several will work because one might not fit every power grid.
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The grid, renewable energy overall, is going to be a sort of patchwork solution.
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And so the more we try these solutions,
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the closer we get to figuring out exactly what the right mix is for what we need for the greater future.
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Từ vựng và ghi chú luyện nói cho bài học này
Bài luyện nói này dựa trên video “How to fix clean energy’s storage problem”. Những từ được nhắc lại nhiều nhất trong bài: energy, renewable, store, potential, pump. Video này có 72 câu và 1011 từ để luyện shadowing. Phần lời nói dài 5:21. Người nói nói nhanh, khoảng 189 từ mỗi phút, nên sẽ có nhiều chỗ nối âm và nuốt âm. Chỉ 79% số từ nằm trong 3.000 từ tiếng Anh thông dụng nhất, nên từ vựng khá khó.
Từ vựng quan trọng trong video
15 từ đáng học trong video, kèm phiên âm và nghĩa:
| Từ | Phiên âm | Nghĩa |
|---|---|---|
| pump danh từ | /pʌmp/ | bơm |
| grid danh từ | /ɡɹɪd/ | lưới, mạng |
| lithium danh từ | /ˈlɪθi.əm/ | lithi, liti |
| convert động từ | /kənˈvɝt/ | cải đạo |
| fossil danh từ | /ˈfɑsl̩/ | hoá thạch |
| turbine danh từ | /ˈtɜː.baɪn/ | tua-bin |
| spin động từ | /spɪn/ | quay |
| generate động từ | /ˈd͡ʒɛn.ə.ɹeɪt/ | sinh ra, gây ra |
| reservoir danh từ | /ˈɹɛz.ə(ɹ).vwɑɹ/ | kho |
| rust danh từ | /ɹʌst/ | rỉ sét |
| technique danh từ | /tɛkˈniːk/ | kỹ thuật, kĩ thuật |
| physics danh từ | /ˈfɪz.ɪks/ | vật lý học |
| principle danh từ | /ˈpɹɪn.sɪ.pəl/ | nguyên lí, nguyên tắc |
| rely động từ | /ɹɪˈlaɪ/ | tin cậy, dựa vào |
| electronics danh từ | /ɪˌlɛkˈtɹɑ.nɪks/ | điện tử học |
Ngữ pháp trong video
Những cấu trúc người nói dùng nhiều nhất, kèm đúng cụm từ trong video:
| Cấu trúc | Trong video |
|---|---|
| Câu bị động be + quá khứ phân từ — nhấn vào việc xảy ra, không phải người làm | can be stored · is only found · were built |
| Thì hiện tại hoàn thành have/has + quá khứ phân từ — việc đã xảy ra nhưng còn liên quan đến hiện tại | have improved · that's actually been · has stored |
Phát âm cần chú ý
Người nói dùng 10 dạng rút gọn, ví dụ don't, isn't, you're. Hãy nói theo dạng ngắn đúng như bạn nghe.
- Âm “th”: lithium /ˈlɪθi.əm/, thermal /ˈθɜːməl/
- Âm “sh” và “zh”: efficient /ɪˈfɪʃənt/, pressurize /ˈpɹɛʃəɹaɪz/
- Từ dài — đặt trọng âm cho đúng: electricity /ɪˌlɛkˈtɹɪsɪti/, electronics /ɪˌlɛkˈtɹɑ.nɪks/, importantly /ɪmˈpɔɹ.tənt.li/, inconvenience /ɪnkənˈvinjəns/, hydroelectric /ˌhʌɪdrəʊɪˈlɛktrɪk/
Những âm người Việt thường gặp khó:
- Cụm phụ âm cuối — đọc đủ từng âm, đừng nuốt âm cuối: pump /pʌmp/, efficient /ɪˈfɪʃənt/, rust /ɹʌst/, physics /ˈfɪz.ɪks/, underground /ˌʌn.dəɹˈɡɹaʊnd/
- Âm /tʃ/, /dʒ/ và /ʒ/ — tiếng Việt không có, đừng đọc thành “ch” hay “gi”: generate /ˈd͡ʒɛn.ə.ɹeɪt/, discharge /dɪsˈtʃɑɹdʒ/
- Âm /æ/ — mở miệng rộng hơn âm “e”: gravity /ˈɡɹævɪti/, attract /əˈtɹækt/, barrel /ˈbæɹəl/, variable [ˈvæɹ.i.ə.bl̩], fascinate /ˈfæsɪneɪt/
Cách luyện với video này
- Nghe hết video một lần, chưa cần nói, và ghi lại những từ bạn chưa biết.
- Bắt đầu ở tốc độ 0,75×, nói đuổi từng câu, rồi quay lại tốc độ bình thường khi đã quen.
- Ghi âm giọng mình rồi so với bản gốc, chú ý các từ như pump, grid, lithium.
Phương Pháp Shadowing Là Gì?
Shadowing là kỹ thuật học ngôn ngữ có cơ sở khoa học, ban đầu được phát triển cho chương trình đào tạo phiên dịch viên chuyên nghiệp và được phổ biến rộng rãi bởi nhà đa ngôn ngữ học Dr. Alexander Arguelles. Nguyên lý cốt lõi đơn giản nhưng cực kỳ hiệu quả: bạn nghe tiếng Anh của người bản xứ và lặp lại to ngay lập tức — như một "cái bóng" (shadow) đuổi theo người nói với độ trễ chỉ 1–2 giây. Khác với luyện ngữ pháp hay học từ vựng bị động, Shadowing buộc não bộ và cơ miệng phải đồng thời xử lý và tái tạo ngôn ngữ thực tế. Các nghiên cứu khoa học xác nhận phương pháp này cải thiện đáng kể phát âm, ngữ điệu, nhịp điệu, nối âm, kỹ năng nghe và độ lưu loát khi nói — đặc biệt hiệu quả cho người luyện IELTS Speaking và muốn giao tiếp tiếng Anh tự nhiên như người bản ngữ.