Luyện nói tiếng Anh bằng Shadowing qua video: Overpopulation – The Human Explosion Explained
Đang tạo bài học...
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Never before in history have there been so many people on Earth as right now.
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Our numbers have skyrocketed from 1 billion in 1800 to 2.3 billion in 1940,
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3.7 billion in 1970 and 7.4 billion in 2016.
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The world population increased fourfold in the last century, so what can we expect for the next century?
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And what does population growth mean for our future?
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Will there be mass migration, overcrowded slums in megacities covering continents, diseases and pollution, chaos and violence over energy,
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water and food, and a human species focused only on sustaining itself?
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Will population growth destroy our way of life, or is this prophecy just ungrounded panic?
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In the 1960s, population growth reached an unprecedented rate, which led to apocalyptic prophecies.
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The poor would procreate endlessly and overrun the developed world.
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The legend of overpopulation was born.
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But it turns out high birth rates and the population explosion are not permanent features of some cultures or countries,
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but rather part of a four-step process the whole world is going through.
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The demographic transition.
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Most developed countries have already made the transition, while other countries are doing it right now.
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Let's go back to the 18th century, when the entire world, including Europe, was in the first stage of the demographic transition.
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By today's standards, Europe was worse off than a developing region, suffering from poor sanitation, poor diets and poor medicine.
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A lot of people were born, but lots of them died just as fast, so the population hardly grew.
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Women had between four and six children, but only two of them would reach adulthood.
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Then the Industrial Revolution happened in the UK and brought the greatest change in human living conditions since the Agricultural Revolution.
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People went from being peasants to workers.
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Manufactured goods were mass-produced and became widely available.
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The sciences flourished and advanced transportation, communication and medicine.
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The role of women in society shifted and created the conditions for their emancipation.
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Slowly, this economic progress not only formed a middle class, but also raised standards of living and healthcare for the poor working population.
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The second transition stage started.
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Better food supplies, hygiene and medicine meant people stopped dying all the time, especially so at a very young age.
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The result was a population explosion, doubling the UK's population between 1750 and 1850.
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The main reason families used to have lots of children was that only a few of them were likely to survive.
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Now that had changed, so the third stage of the transition was set in motion, fewer babies were conceived and population growth slowed down.
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Eventually, a balance emerged.
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Fewer people were dying and fewer children were born, so the death rate and birth rate became stable.
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Britain had reached the fourth stage of the demographic transition.
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This didn't only happen in the UK.
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More and more countries went through the four stages.
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First, many births and many deaths due to bad living conditions.
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Second, better living conditions leading to fewer deaths and a population explosion.
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Third, fewer deaths resulting in fewer births, and population growth came to an end.
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But if birth rates have dropped so much, why is the population still growing so fast?
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Well, the children born in the population explosion of the 70s and 80s are having kids themselves now, leading to a noticeable spike in overall population.
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But they are having far fewer children on average than their parents.
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The average today is 2.5.
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It was 5 40 years ago.
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So as this generation gets older and fertility declines further, the rate of population growth will keep on slowing.
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This is true for every country.
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In the West, we tend to overlook progress in other regions of the world.
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But actually, most of the world's countries have made it to the fourth stage.
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Just look at Bangladesh.
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In 1971, the average woman had seven kids, but 25% of them would die before the age of five.
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In 2015, the mortality rate was down to 3.8% and women had only 2.2 kids on average.
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This is the rule, not an exception.
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We're not special, we just had a head start.
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It took developed countries about 80 years to reduce fertility from more than 6 children to less than 3.
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Others are catching up fast.
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Malaysia and South Africa did it in only 34 years.
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Bangladesh took just 20.
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Iran managed it in 10 years.
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All these countries that are catching up didn't have to start from scratch, and the more support they get, the faster they catch up.
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This is why programs that help lower child mortality or help poor nations develop are so important.
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No matter what your motivation is, whether you dream of a world where more people live in freedom and wealth, or you just want fewer refugees coming to your country,
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the simple truth is that it's beneficial to you personally
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if people on the other side of the globe can live a good life.
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And we are getting there.
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The percentage of people living in extreme poverty has never been as low as today.
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So the future of global population growth is actually not an apocalyptic prophecy at all.
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It's a promise.
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Population growth will come to an end.
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The UN forecasts that the 12th billionth human will never be born at all.
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And, as the development level of the world rises, the number of people with a higher education will increase tenfold.
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Countries who used to be in need will help advance development instead.
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More people is going to mean more people able to advance our species.
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This video was a collaboration with Max Rosa and Our World in Data, where he explores the progress of humanity through research and data visualization.
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Make sure to check it out.
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In 2016 we were able to make more and better content than ever before because of your support on Patreon.com.
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Thank you so much, and we'll be back in the year 12,017.
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Từ vựng và ghi chú luyện nói cho bài học này
Video này có 75 câu và 977 từ để luyện shadowing. Phần lời nói dài 6:36. Người nói giữ tốc độ đều, khoảng 148 từ mỗi phút, vừa sức để nói đuổi theo. 87% số từ nằm trong 3.000 từ tiếng Anh thông dụng nhất, nên từ vựng dễ theo.
Từ vựng quan trọng trong video
15 từ đáng học trong video, kèm phiên âm và nghĩa:
| Từ | Phiên âm | Nghĩa |
|---|---|---|
| explosion danh từ | /ɛkˈsploʊ.ʒən/ | nổ |
| prophecy danh từ | /ˈpɹɑfɪsi/ | tiên tri |
| percentage danh từ | /pə(ɹ)ˈsɛntɪd͡ʒ/ | số phần trăm, tỷ lệ phần trăm |
| stable danh từ | /ˈsteɪ.bəl/ | chuồng, chuồng ngựa |
| poverty danh từ | /ˈpɑːvɚti/ | sự nghèo nàn |
| suffer động từ | /ˈsʌfɚ/ | chịu đựng |
| legend danh từ | /ˈlɛd͡ʒ.ənd/ | truyền thuyết, huyền thoại |
| worker danh từ | /ˈwɝ.kɚ/ | công nhân |
| exception danh từ | /əkˈsɛpʃən/ | lệ ngoại, ngoại lệ |
| humanity danh từ | /hjuˈmænɪti/ | nhân loại, loài người |
| explore động từ | /ɪkˈsploɹ/ | thám hiểm |
| globe danh từ | /ɡloʊb/ | quả địa cầu |
| chaos danh từ | /ˈkeɪˌɑs/ | hỗn loạn |
| panic danh từ | /ˈpænɪk/ | hốt hoảng |
| pollution danh từ | /pəˈluʃən/ | sự ô nhiễm |
Phát âm cần chú ý
Người nói dùng 4 dạng rút gọn, ví dụ didn't, we'll, we're. Hãy nói theo dạng ngắn đúng như bạn nghe.
- Âm “sh” và “zh”: transition /tɹænˈzɪʃ.ən/, explosion /ɛkˈsploʊ.ʒən/, exception /əkˈsɛpʃən/, collaboration /kəˌlæbəˈɹeɪʃən/, motivation /ˈmoʊ.tə.veɪ.ʃən/
- Từ dài — đặt trọng âm cho đúng: demographic /ˌdɛm.əˈɡɹæf.ɪk/, mortality /mɔɹˈtælɪti/, fertility /fɝˈtɪləti/, humanity /hjuˈmænɪti/, collaboration /kəˌlæbəˈɹeɪʃən/
Cách luyện với video này
- Nghe hết video một lần, chưa cần nói, và ghi lại những từ bạn chưa biết.
- Nói đuổi từng câu ở tốc độ bình thường, lặp lại mỗi câu đến khi nhịp của bạn khớp với người nói.
- Ghi âm giọng mình rồi so với bản gốc, chú ý các từ như explosion, prophecy, percentage.
Ngữ pháp trong video
Những cấu trúc người nói dùng nhiều nhất, kèm đúng cụm từ trong video:
| Cấu trúc | Trong video |
|---|---|
| “Used to” used to + động từ — thói quen hoặc tình trạng trong quá khứ nay không còn | used to have · used to be |
| Thì hiện tại hoàn thành have/has + quá khứ phân từ — việc đã xảy ra nhưng còn liên quan đến hiện tại | have skyrocketed · have already made · have dropped |
| Câu bị động be + quá khứ phân từ — nhấn vào việc xảy ra, không phải người làm | was born · were born · was set |
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.