Luyện nói tiếng Anh bằng Shadowing qua video: How to Survive a Grenade Blast
Đang tạo bài học...
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(water splashing) - So I'm here today in Florida filming with Kevin, more commonly known as The Backyard Scientist.
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- That's right.
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- And today we're gonna take these two live grenades, and we're gonna be dipping 'em in this tub of liquid nitrogen.
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So go ahead and hand 'em to me.
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And then dude, baby alligator.
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(grenades bouncing) (water splashes) (classical uplifting music) So now we're both about 15 feet away, except I'm on land with a grenade on land, and Kevin is in the water with a grenade in the water.
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So the question is, which one of us has a better chance of survival?
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Take a moment to decide, do you dive on the pool deck or jump in the pool?
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We both had very different theories for survival.
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So as firm believers in the scientific method, we decided to test out our hypotheses.
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So we devised some experiments.
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But before I get to those, I think it's important to understand how a grenade actually works.
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So once you pull the pin, as long as you keep this handle pushed down, you're perfectly safe.
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But as soon as you let go of the grenade, this handle springs off which releases a spring loaded striker that hits a percussion cap that starts a five second fuse that you can't do anything to stop.
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And I never really thought about it until I made this video but the reason you see a waffle pattern in grenades is to create weak points in the shell.
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So that's where it's going to break first.
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And since there are 40 bumps, this grenade is basically an explosion that shoots 40 bullets in all directions.
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In warfare, that's what makes them lethal.
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So the best strategy is to get as far as possible in a few seconds, and then hit the deck with your feet facing towards the grenade.
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This presents the smallest possible target for a flying grenade chunk to hit.
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So 15 feet away.
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Mathematically, that puts my chances of getting hit at less than 1%.
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But things are even better for Kevin in the pool.
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It's been well documented that bullets do not travel far in water at all.
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The drag force is so high, they just disintegrate after a few feet.
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So he has a 0% chance of getting injured by a grenade fragment in the water.
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But we are thorough men of science and we wanted more information.
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So we designed an experiment where we filled three balloons, half with water and half with air to roughly mimic the human body, which is mostly water, but we have pockets of air in our lungs, intestines, in our sinuses, in our ears, and then we subjected them to identical explosions, identical distances apart in both air (shot fires) and water.
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(shot fires) As you can see, there isn't much effect on land, because air is compressible, which helps dissipate energy, plus the blast wave reflects around objects.
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But in water, the story is different.
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Water is incompressible, which means not only is the blast wave not dissipated, but it passes right through your mostly water body.
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So the air in these balloons represents the air in your body, like your lungs and your sinuses.
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So basically what's happening is the blast wave is pushing in on you, but the air cavities can't push back with the same force, since they're filled with compressible air, that means they move a lot really quickly, which causes permanent damage.
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As a control, you could see this balloon that is filled with just water.
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It is perfectly fine.
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That would be like your arms and legs, which have no air in them, and they are basically incompressible like water, and would be fine.
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An explosion underwater is sort of like the silver ball things.
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So this represents the initial energy of the blast, which then comes down and passes through the incompressible water, and then comes out without losing any energy at the water surface.
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But now your squishable lungs are surrounded by incompressible water in the path of the blast wave.
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And so when the blast happens, there's a lot of relative motion, which is bad if you like your lungs the way they are right now.
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And sadly, our experiment is verified in real life.
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So these jerks throw an M80 into the water, and you can see the devastating effect it has.
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On land, if a bird were that close to an M80, it would be startled, but it would be perfectly fine.
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So now that you know, think back, which did you choose?
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While it's true, there is a small chance you would get unlucky with the grenade chunk if you chose to dive next to me.
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If you chose to join Kevin, you will be in that pool for the rest of your life.
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(upbeat video game music) So huge thanks to the backyard scientist for dying in the name of science.
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If you've never seen his stuff, you just have to check it out.
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Here's a video we just finished filming.
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- It's a bunch of which is a non-Newtonian fluid, and we destroyed it in every way imaginable.
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- It's incredible footage.
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His channel is full of this type of junk.
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So check it out, subscribe, and as always, thanks for watching.
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Từ vựng và ghi chú luyện nói cho bài học này
Bài luyện nói trình độ B2 này dựa trên video “How to Survive a Grenade Blast”. Những từ được nhắc lại nhiều nhất trong bài: grenade, blast, incompressible, lungs, Kevin. Video này có 53 câu và 886 từ để luyện shadowing. Phần lời nói dài 4:55. Người nói nói nhanh, khoảng 180 từ mỗi phút, nên sẽ có nhiều chỗ nối âm và nuốt âm. 82% số từ nằm trong 3.000 từ tiếng Anh thông dụng nhất; phần còn lại nên xem trước khi luyện.
Từ vựng quan trọng trong video
15 từ khó nhất trong video, kèm phiên âm và nghĩa:
| Từ | Phiên âm | Nghĩa |
|---|---|---|
| grenade danh từ | /ɡɹəˈneɪd/ | lựu đạn |
| lung danh từ | /ˈlʌŋ/ | phổi |
| balloon danh từ | /bəˈlun/ | khí cầu, bóng bay |
| chunk danh từ | /t͡ʃʌŋk/ | mảnh, mẩu |
| splash động từ | /splæʃ/ | tung toé |
| backyard danh từ | /bækˈjɑːd/ | sân sau |
| dive động từ | /daɪv/ | lặn |
| alligator danh từ | /ˈæl.ɪ.ɡeɪ.tɚ/ | cá sấu |
| devise động từ | /dɪˈvaɪz/ | đề ra, vạch ra |
| intestine danh từ | /ɪnˈtɛs.tɪn/ | ruột |
| startle động từ | /ˈstɑɹt(ə)l/ | làm giật mình, làm hoảng hốt |
| unlucky tính từ | /ʌnˈlʌki/ | xui xẻo, xui |
| believer danh từ | /bɪˈlivɚ/ | tín đồ, giáo đồ |
| nitrogen danh từ | /ˈnaɪ.tɹə.d͡ʒən/ | nitơ, đạm khí |
| surround động từ | /səˈɹaʊnd/ | bao vây |
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 | is filled · are surrounded · is verified |
| Mệnh đề quan hệ who / which + mệnh đề — thêm thông tin về người hoặc vật | body, which is · incompressible, which means · legs, which have |
Phát âm cần chú ý
Người nói dùng 13 dạng rút gọn, ví dụ we're, can't, gonna. Hãy nói theo dạng ngắn đúng như bạn nghe.
- Âm “th”: lethal /ˈliː.θəl/, hypothesis /haɪˈpɒθɪsɪs/, thorough /ˈθʌɹoʊ/
- Âm “sh” và “zh”: splash /splæʃ/, percussion /pɚˈkʌʃən/, squishable /ˈskwɪʃəbəl/
- Từ dài — đặt trọng âm cho đúng: alligator /ˈæl.ɪ.ɡeɪ.tɚ/, disintegrate /dɪsˈɪntɪɡɹeɪt/, imaginable /ɪˈmæd͡ʒɪnəbəl/, hypothesis /haɪˈpɒθɪsɪs/, underwater /ʌndɚˈwɔtəɹ/
Những âm người Việt thường gặp khó:
- Cụm phụ âm cuối — đọc đủ từng âm, đừng nuốt âm cuối: chunk /t͡ʃʌŋk/, fragment /ˈfɹæɡmənt/, surround /səˈɹaʊnd/, bump /bʌmp/, bounce /baʊns/
- Âm /tʃ/, /dʒ/ và /ʒ/ — tiếng Việt không có, đừng đọc thành “ch” hay “gi”: chunk /t͡ʃʌŋk/, imaginable /ɪˈmæd͡ʒɪnəbəl/, injure /ˈɪn.d͡ʒɚ/, nitrogen /ˈnaɪ.tɹə.d͡ʒən/, junk /d͡ʒʌŋk/
- Âm /æ/ — mở miệng rộng hơn âm “e”: splash /splæʃ/, backyard /bækˈjɑːd/, alligator /ˈæl.ɪ.ɡeɪ.tɚ/, imaginable /ɪˈmæd͡ʒɪnəbəl/, fragment /ˈfɹæɡmənt/
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 grenade, lung, balloon.
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.