Prática de Shadowing: Nanotechnology and Its Applications - Aprenda a falar inglês com vídeo
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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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Por que praticar fala com esse vídeo?
O vídeo sobre nanotecnologia é uma excelente oportunidade para aprender inglês com YouTube e aprimorar sua fala por meio do shadow speak. A linguagem é clara, mas repleta de termos técnicos e frases complexas, o que ajuda a treinar a fluência em contextos acadêmicos e profissionais. Ao imitar a pronúncia e o ritmo do locutor, você desenvolve não só a articulação, mas também a compreensão auditiva. O shadowing em inglês aqui é eficaz porque a fala é natural, com pausas e ênfases que refletem uma aula real, preparando você para situações reais de comunicação.
Gramática e expressões no contexto
Analisando o vídeo, identificamos estruturas chave para praticar:
- "It's the science... conducted at the nanoscale": Uso de partículas passivas para descrever processos técnicos. Essa estrutura é essencial em textos acadêmicos e ajuda a manter a formalidade.
- "Such nanotubes have become increasingly attractive...": O uso de "such" para se referir a um termo anterior (nanotubos) é comum em explicações lógicas. Pratique conectar ideias com essa palavra.
- "thereby minimizing the environmental impact": "Thereby" + gerúndio é uma forma elegante de mostrar consequências. Ideal para argumentos claros e concisos.
Armadilhas comuns de pronúncia
Algumas palavras no vídeo podem ser desafiadoras. Veja como evitá-las:
- "Nanotechnology": A pronúncia correta é /ˌnænəʊtekˈnɒlədʒi/ (nã-no-tek-nól-o-ji). Muitos aprendizes erram o "nano" como "nã-no" em vez de "næn-o". Use o shadowspeak para imitar o acento do locutor.
- "Bioavailability": /ˌbaɪəʊəˌveɪləˈbɪləti/ (bi-o-a-vei-la-bili-ti). A combinação de "bio" e "availability" requer atenção à sílaba tônica no "vei".
- "Antiseptic": /ˌæntiˈseptɪk/ (ãn-ti-séptik). Evite pronunciar "anti" como "ãnti" com ênfase no "i"; a ênfase está no "séptik".
Com essas dicas, o shadowing em inglês se torna mais eficaz, ajudando você a dominar não só a fala, mas também o vocabulário técnico e a gramática contextualizada.
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.