Luyện nói tiếng Anh bằng Shadowing qua video: Cambridge IELTS 17 Test 4 Reading passage 1
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Bats to the Rescue How Madagascar's bats are helping to save the rainforest.
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There are few places in the world where relations between agriculture and conservation are more strained.
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Madagascar's forests are being converted to agricultural land at a rate of 1% every year.
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Much of this destruction is fueled by the cultivation of the country's main staple crop, rice.
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And a key reason for this destruction is
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that insect pests are destroying vast quantities of what is grown by local subsistence farmers, leading them to clear forests to create new paddy fields.
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The result is devastating habitat and biodiversity loss on the island, but not all species are suffering.
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In fact, some of the island's insectivorous bats are currently thriving, and this has important implications for farmers and conservationists alike.
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Enter University of Cambridge zoologist Ricardo Rocha.
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He's passionate about conservation and bats.
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More specifically, he's interested in how bats are responding to human activity and deforestation in particular.
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Rocha's new study shows
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that several species of bats are giving Madagascar's rice farmers a vital pest control service by feasting on plagues of insects.
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And this, he believes, can ease the financial pressure on farmers to turn forest into fields.
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Bats comprise roughly one-fifth of all mammal species in Madagascar and 36 recorded bat species are native to the island,
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making it one of the most important regions for conservation of this animal group anywhere in the world.
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Co-leading an international team of scientists, Rocha found
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that several species of indigenous bats are taking advantage of habitat modification to hunt insects swarming above the country's rice fields.
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They include the Malagasy mouse-eared bat, Major's long-fingered bat, the Malagasy white-bellied free-tailed bat, and Peters' wrinkle-lipped bat.
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These winter species are providing a valuable free service to Madagascar as biological pest suppressors, says Rocha.
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We found that six species of bat are preying on rice pests, including the paddy-swarming caterpillar and grass webworm.
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The damage which these insects cause puts the island's farmers under huge financial pressure, and that encourages deforestation.
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The study, now published in the journal Agriculture, Ecosystems, and Environment, set out to investigate the feeding activity of insectivorous bats in
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the farmland bordering the Rana Mofana National Park in the southeast of the country.
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Rocha and his team used state-of-the-art ultrasonic recorders to record over a thousand bat-feeding buzzes, echolocation sequences used by bats to target their prey,
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at 54 sites, in order to identify the favorite feeding spots of the bats.
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They next used DNA barcoding techniques to analyze droppings collected from bats at the different sites.
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The recordings revealed that bat activity over rice fields was much higher than it was in continuous forest, seven times higher over rice fields which were on flat ground,
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and 16 times higher over fields on the sides of hills, leaving no doubt that the animals are preferentially foraging in these man-made ecosystems.
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The researchers suggest that the bats favor these fields
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because lack of water and nutrient runoff make these crops more susceptible to insect pest infestations.
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DNA analysis showed that all six species of bat had fed on economically important insect pests.
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While the findings indicated that rice farming benefits most from the bats, the scientists also found indications that the bats were consuming pests of other crops,
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including the black twig borer, which infests coffee plants, the sugarcane cicada, the macadamia nut borer, and the sober tabby,
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a pest of citrus fruits.
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The effectiveness of bats as pest controllers has already been proven in the USA and Catalonia, said co-author James Kemp from the University of Lisbon.
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But our study is the first to show this happening in Madagascar, where the stakes for both farmers and conservationists are so high,
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local people may have a further reason to be grateful to their bats.
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While the animal is often associated with spreading disease, Rocha and his team found evidence that Malagasy bats feed not just on crop pests,
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but also on mosquitoes, carriers of malaria, Rift Valley fever virus and elephantiasis, as well as blackflies, which spread river blindness.
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Rocha points out that the relationship is complicated.
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When food is scarce, bats become a crucial source of protein for local people.
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Even the children will hunt them.
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And as well as roosting in trees, the bats sometimes roost in buildings, but are not welcomed there because they make them unclean.
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At the same time, however, they are associated with sacred caves and their ancestors, so they can be viewed as beings between worlds,
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which makes them very significant in the culture of the people.
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And one potential problem is that while these bats are benefiting from farming, at the same time deforestation is reducing the places where they can roost,
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which could have long-term effects on their numbers.
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Rocha says, With the right help, we hope that farmers can promote this mutually beneficial relationship by installing bat houses.
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Rocha and his colleagues believe that maximizing bat populations can help to boost crop yields and promote sustainable livelihoods.
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The team is now calling for further research to quantify this contribution.
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I'm very optimistic, says Rocha.
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If we give nature a hand, we can speed up the process of regeneration.
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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 “Cambridge IELTS 17 Test 4 Reading passage 1”. Những từ được nhắc lại nhiều nhất trong bài: bat, pest, Rocha, species, farmers. Video này có 53 câu và 881 từ để luyện shadowing. Phần lời nói dài 5:18. Người nói nói với tốc độ tự nhiên, khoảng 166 từ mỗi phút, gần với hội thoại hằng ngày. Chỉ 71% 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 khó nhất trong video, kèm phiên âm và nghĩa:
| Từ | Phiên âm | Nghĩa |
|---|---|---|
| farmer danh từ | /ˈfɑɹ.mɚ/ | nông dân |
| insect danh từ | /ˈɪn.sɛkt/ | sâu bọ, côn trùng |
| deforestation danh từ | /dɪˌfɒɹɪsˈteɪʃən/ | phá rừng |
| paddy danh từ | /ˈpædi/ | ruộng lúa |
| ecosystem danh từ | /ˈikoʊˌsɪstəm/ | hệ sinh thái |
| prey danh từ | /pɹeɪ/ | mồi |
| ancestor danh từ | /ˈæn.sɛs.tɚ/ | tổ tiên |
| biodiversity danh từ | /ˌbaɪoʊdəˈvɚsəti/ | đa dạng sinh học |
| blindness danh từ | /ˈblaɪndnəs/ | chứng mù |
| caterpillar danh từ | /ˈkætɚˌpɪlɚ/ | sâu, sâu róm |
| cicada danh từ | /sɪˈkeɪ.də/ | ve sầu |
| livelihood danh từ | /ˈlaɪvlihʊd/ | sinh kế |
| macadamia danh từ | /mækəˈdeɪmi.ə/ | mắc ca |
| mammal danh từ | /ˈmæməl/ | động vật có vú, thú |
| rainforest danh từ | /ˈɹeɪn.fɔɹ.ɪst/ | rừng mưa |
Phát âm cần chú ý
- Âm “th”: thrive /θɹajv/, southeast /sawˈθɪjst/
- Âm “sh” và “zh”: deforestation /dɪˌfɒɹɪsˈteɪʃən/, echolocation /ˌɛkoʊloʊˈkeɪʃən/, infestation /ˌɪnfɛsˈteɪ̯ʃən/, preferentially /ˈpɹɛf.ɜː(ɹ)ˌɛn.ʃə.li/, implication /ˌɪmpləˈkeɪʃən/
- Từ dài — đặt trọng âm cho đúng: deforestation /dɪˌfɒɹɪsˈteɪʃən/, insectivorous /ˌɪnsɛkˈtɪv(ə)ɹəs/, ecosystem /ˈikoʊˌsɪstəm/, biodiversity /ˌbaɪoʊdəˈvɚsəti/, caterpillar /ˈkætɚˌpɪlɚ/
Những âm người Việt thường gặp khó:
- Cụm phụ âm cuối — đọc đủ từng âm, đừng nuốt âm cuối: pest /pɛst/, insect /ˈɪn.sɛkt/, roost /ɹust/, swarm /swɔɹm/, farmland /ˈfɑːɹmlænd/
- Âm /tʃ/, /dʒ/ và /ʒ/ — tiếng Việt không có, đừng đọc thành “ch” hay “gi”: forage /ˈfoɹɪd͡ʒ/, zoologist /zoʊˈɑləd͡ʒɪst/, mutually /ˈmjut͡ʃuəli/, researcher /ˈɹiˌsɝ.t͡ʃɚ/, indigenous /ɪnˈdɪd͡ʒənəs/
- Âm /æ/ — mở miệng rộng hơn âm “e”: paddy /ˈpædi/, habitat /ˈhæb.ɪ.tæt/, ancestor /ˈæn.sɛs.tɚ/, caterpillar /ˈkætɚˌpɪlɚ/, farmland /ˈfɑːɹmlænd/
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 farmer, insect, deforestation.
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.