跟读练习: Nanotechnology and Its Applications - 通过视频学习英语口语
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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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真实场景：纳米技术讲座
想象一下，你正在大学听一场关于纳米技术的讲座，讲师用清晰的英语介绍其定义、应用和争议。这样的场景不仅能让你了解前沿科技，更是练习英语听力和口语的好机会。通过观看这类YouTube视频学英语，你能接触到学术领域的专业表达，提升听力理解能力，还能模仿 native speaker 的发音和语调。
实用短语与搭配
- manipulation of matter：物质操控（纳米技术的核心概念，记住这个短语能帮你听懂科技类讲座）
- bioavailability of nutritional ingredients：营养成分的生物利用度（食品科学中的常用表达，在听力中遇到类似话题能快速反应）
- toxic side effects：毒副作用（医学领域高频短语，口语表达时准确又专业）
- shape memory alloys：形状记忆合金（材料科学术语，拓展词汇量的好机会）
- international collaborations：国际合作（时政、科技类话题必备搭配）
你的影子跟读挑战
现在就打开视频，找到“在食品加工行业，纳米技术被用于应对缺铁性贫血”这段内容。跟着讲师的节奏，进行英语影子跟读练习：先听一遍原句，然后立刻重复，注意模仿发音、语调和停顿。这个方法被称为“shadow speak”，能有效提高英语发音和口语流畅度。每天坚持10分钟，你会发现自己的听力和口语进步神速。别害怕出错，勇敢开口，你离流利英语更近一步啦！
什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。