シャドーイング練習: Nanotechnology and Its Applications - 動画で英語スピーキングを学ぶ
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Part 4 You will hear part of a lecture on nanotechnology and its applications.
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First, you have some time to look at questions 31 to 40.
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Now listen carefully and answer questions 31 to 40.
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Today's lecture is the first of a series of lectures on nanotechnology.
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Nanotechnology, sometimes shortened to nanotech, refers to the manipulation of matter on an atomic and molecular level.
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It's the science, engineering and technology conducted at the nanoscale, which is about 1 to 100 nanometres.
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It is the study and application of extremely small things and can be used across all the other science fields.
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Just how small is that?
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A nanometre is one billionth of a metre.
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The idea of nanoscale research first started from a physicist called Richard Feynman in 1959,
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He envisaged a process in which scientists would be able to manipulate and control individual atoms and molecules.
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In fact, it wasn't until 1981, with the invention of a special kind of microscope, that modern nanotechnology truly began.
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Even though nanotechnology has created many new materials and devices with a vast range of applications, there is always concern over these unnatural products.
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Many people are worried that they may pose a threat to the environment, health and safety, also known as EHS.
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In order to better understand and evaluate the potential harm, risk assessment has been introduced.
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There are also ongoing international collaborations on nanoEHS research and related policy issues.
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Despite the concern nanotechnology has benefited society in unexpected ways, In the food processing industry,
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nanotechnology is leveraged against iron deficiency, which triggers anemia.
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For example, by reducing the particle size in potatoes,
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this new technology improves the bioavailability of this nutritional ingredient without the tendency to cause colour and odour changes.
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In terms of packaging, nanomaterials are more economical and are used in all sorts of products, chocolate in particular.
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Nanotechnology can also enhance the flavour of food.
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On a domestic scale, we expect more smart furniture, which is made of shape memory alloys, to be manufactured.
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But nanotechnology has much wider application than this and could also help develop sustainable agriculture.
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It offers great potential to strengthen the effect of fertilizers, thereby minimizing the environmental impact and boosting the productivity of plants in the soil.
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In the area of medicine, bioengineers have developed simple and inexpensive nanoscale delivery vehicles,
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Conductors like carbon nanotubes have been invented with varying structures.
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Such nanotubes have become increasingly attractive to researchers because of their ability to efficiently deliver drugs into veins.
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This means that higher doses of drugs loaded on them can be transported from the administration sites to the effects -related sites, such as cancer focuses.
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thus decreasing toxic side effects while increasing the treatment effects.
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The research team has also developed a widely accepted material that can be used to coat different surfaces, including wood, plastic and glass.
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It is mainly comprised of silver.
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Such nanoparticles can eventually kill some microbes due to the antiseptic properties.
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The whole process is simple, easy to apply and, more importantly, harmless to the environment.
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Surprisingly, nanotechnology has major implications for our health as well.
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By changing the metabolic rate through a particular type of protein, obese patients are able to burn calories faster, even under a high calorie diet.
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Therefore, treatment programs are provided for patients to lose weight by disposing of excess fat in a relatively safer manner.
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The finding may help explain why overweight people struggle to lose weight.
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Their stored fat is actively fighting against their efforts to burn it off at the molecular level.
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Further research is mainly focused on the clinical and commercial developments of therapies for obesity,
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diabetes and other associated conditions such as heart disease.
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In terms of cosmetics, the applications of nanotechnology and nanomaterials can be found in many products.
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There are two main uses for nanotechnology in cosmetics.
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caused by the sun.
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In addition, nanotechnology has played an important role in delivering active ingredients to the skin.
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The mechanism proves to improve the bioavailability of actives and enhance skin hydration.
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The wide variety of nanotechnology applications leave no doubt that this field will only continue to get more exciting,
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and I look forward to seeing these developments further branch out.
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That is the end of part four.
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You now have one minute to check your answers to part four.
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この動画でスピーキング練習をする理由
ナノテクノロジーという学術的なテーマを取り上げたこの動画は、IELTS スピーキング対策や一般的な英語スピーキング練習に最適です。講義形式の会話は、論理的な語彙や複雑な文構造を含み、実践的なシャドーイング（shadow speech / shadowspeak）の機会を提供します。専門用語と日常語のバランスが良く、発音やイントネーションの練習にも役立ち、学術的なコミュニケーション能力を向上させます。
文脈の中の文法と表現
- 「refer to～」：「ナノテクノロジーとは～を指す」という定義を表す際に使われる。例："Nanotechnology refers to the manipulation of matter..." では、用語の説明に不可欠な構造です。
- 「there is concern over～」：「～に対する懸念がある」というネガティブな観点を述べる場合に便利。例："there is always concern over these unnatural products" のように、問題点を提起するのに適しています。
- 「thereby～ing」：「それによって～する」という結果を表す。例："minimizing the environmental impact and boosting productivity" では、原因と結果の関係を明確にします。
発音の注意点
英語の発音を良くするためには、次の単語に注意が必要です。nanotechnology（ナノテクノロジー）の「nano-」は /nænəʊ/ ではなく /nænoʊ/ と発音し、bioavailability（生物学的利用能）は /baɪoʊəˌveɪləˈbɪləti/ と長い単語でもリズムを崩さないこと。また、antiseptic（防腐剤の）の「anti-」は /ænti/ ではなく /æntaɪ/ と発音するのが一般的です。シャドーイングの際は、これらの単語をゆっくり繰り返し練習しましょう。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。