跟读练习: Biofuels and bioprospecting for beginners - Craig A. Kohn - 通过YouTube学习英语口语
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Transcriber: Andrea McDonough Reviewer: Jessica Ruby Your car, the heating system in your house, your gas stove.
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Transcriber: Andrea McDonough Reviewer: Jessica Ruby Your car, the heating system in your house, your gas stove.
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Most of the energy you use comes from fossil fuels, which present a couple of problems.
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First, there are limited supplies of fossil fuels, so the more we use, the less we've got.
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And second, the use of fossil fuels is the main cause of climate change because it releases large amounts of carbon dioxide into the atmosphere.
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Biofuels come from natural, renewable sources like plants, so they have the potential to reduce our reliance on those limited supply fossil fuels and reduce the risk of climate change.
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Most biofuels today are made from corn grain that is fermented into ethanol.
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But we have a limited supply of this corn, so it's not a solution to the limited supply part of the quandary.
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It also takes a lot of resources to grow corn grain.
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Strike 2! A potential solution: Using cellulose instead of corn grain to make ethanol.
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Cellulose is far more abundant than corn grain and takes less energy to produce.
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In fact, it's the most abundant organic molecule on the planet!
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Cellulose is the main ingredient found in a plant's cell wall.
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Plants generate cellulose from water and carbon dioxide during photosynthesis.
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So, where as using fossil fuels produce carbon dioxide, using cellulose-based ethanol might help remove carbon dioxide from the atmosphere.
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The main obstacle is that the cellulose molecule, a long, connected chain of glucose sugar protected by a tough, molecular sheath, is difficult to break apart.
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Creating cellulose-based ethanol means first unwrapping that protective sheath and then chopping up the cellulose into its individual glucose molecule.
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Only once we have unpacked each glucose molecule, can we begin fermentation.
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But some microorganisms, like bacteria or fungi, break down cellulose for energy all the time.
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For example, dairy cows eat foods like hay or alfalfa, which are full of cellulose.
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Microbes that live in their stomachs produce an enzyme called cellulase, which breaks apart the cellulose molecules so that the cow can use what's left for energy.
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Researchers are now studying these kinds of microorganisms in the hopes of finding better ways to break down cellulose so we can use it for our own energy needs.
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The solution, they think, lies in finding microbes in nature that can produce the kinds of cellulase enzymes that we need.
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This process of searching for species in nature that can produce valuable products is called bioprospecting.
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To test whether or not a sample of microbes can break down cellulose effectively, researchers first grow the microbe in a test tube.
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Then, they add a source of cellulose as the sole form of energy.
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If the microbe can't produce cellulase and break down cellulose, the test tube will remain unchanged.
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But if the microbe produces the enzymes we are looking for, it will be able to break down cellulose, use it for energy, and thrive in its test tube environment.
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If our microbial sample can break down the cellulose in the test tube, there is a chance we could use it to create a renewable and sustainable source of fuel for our cars from cellulose.
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背景与背景
在现代社会中，汽车、家中的暖气系统以及煤气灶等设备大多依赖于化石燃料。然而，化石燃料的供应有限，其使用不仅影响能源的可持续性，还导致气候变化。因此，开发生物燃料，特别是基于纤维素的生物燃料，成为了一个重要的研究课题。这种燃料来自可再生的天然资源，例如植物，能够减少对化石燃料的依赖，也可能减缓气候变化的影响。
日常交流的五个常用短语
- Fossil fuels（化石燃料）: 了解这个词汇有助于讨论能源问题。
- Climate change（气候变化）: 常见于环保相关讨论，重要的环境用语。
- Renewable sources（可再生资源）: 在谈到可持续发展时常出现的短语。
- Microorganisms（微生物）: 生物学及生态学讨论中不可或缺的词汇。
- Bioprospecting（生物探勘）: 了解这一术语有助于掌握生物研究与开发的背景。
逐步跟读指导
若您希望通过此视频提高您的英语口语和发音技能，以下是一些实用的步骤：
- 观看视频: 首先，看YouTube学英语，完整观看视频，以获取上下文和对话的整体理解。
- 分段朗读: 在视频播放时，暂停每个小节，尝试模仿说话者的语气和发音。这将帮助您提高英语发音。
- 对照阅读: 查找视频的英文文本，边听边读，可以更清晰地理解如何发音及用词。
- 逐字跟读: 使用您学到的短语进行shadow speak，即模拟说话者的发音和节奏。这对于英语口语练习非常有效。
- 反复练习: 重复以上步骤，特别注重那些您觉得困难的部分。持之以恒，您的口语能力将逐渐提升。
通过这种系统性的学习方式，您可以在生物科技领域的相关话题中自如交流，增强自身语言能力。
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。