跟读练习: Where did Earth’s water come from? - Zachary Metz - 通过YouTube学习英语口语
C1
It has no taste, color, or smell, and we often look right through it.
25 句
如果句子过短或过长，请点击 Edit 进行调整。
1
It has no taste, color, or smell, and we often look right through it.
2
It covers over 70% of the Earth, cycling from the oceans and rivers to the clouds and back again.
3
It even makes up about 60% of our bodies.
4
With all this water around and inside us, it's easy to take its presence for granted.
5
But in the rest of the solar system, liquid water is almost impossible to find.
6
So how did our planet end up with so much of this substance and where did it come from?
7
As you probably know, a water molecule consists of two basic parts.
8
Hydrogen, the simplest of all elements, has been around since close to the beginning of our universe.
9
Oxygen entered the scene several hundred million years later after stars began to form.
10
The massive pressure at the center of these fiery infernos was so great that hydrogen atoms fused together to form helium.
11
Helium, in turn, fused to form heavier elements, like beryllium, carbon, and oxygen in a process known as nucleosynthesis.
12
When stars eventually collapsed and exploded into supernovas, these new elements were spread across the universe and combined into new compounds, like the now familiar H2O.
13
These water molecules were present in the dusty cloud that formed our solar system and more collided with our planet after its formation.
14
But there's a big question that we don't have the answer to: how much water arrived on Earth, and when?
15
If, as one theory goes, relatively small amounts of water were present on Earth when the rock formed, the high temperatures and lack of any surrounding atmosphere would have caused it to evaporate back into space.
16
Water would have been unable to remain on the planet until hundreds of millions of years later when our first atmosphere formed through a process called outgassing.
17
This occurred when molten rock in the Earth's core released volcanic gasses to the surface, creating a layer that could then trap escaping water.
18
So how then did water get back to the planet?
19
Scientists have long suspected that much of it was brought by ice-bearing comets, or more likely asteroids that bombarded the Earth over millions of years.
20
Recent research has challenged this theory.
21
In examining carbonaceous chondrite meterorites that formed shorty after the birth of our solar system, scientists have found that not only did they contain water, but their mineral chemical composition matched rocks on Earth and samples from an asteroid that formed at the same time as our planet.
22
This suggests that the Earth may have accumulated a substantial amount of water early on that was able to stay put, despite the lack of an atmosphere, though asteroids may have brought more over the eons.
23
If this turns out to be true, life may have formed much earlier than previously thought.
24
So we do not yet definitively know whether the water on Earth came from its initial formation, later impacts, or some combination of the two.
25
Regardless, the water that runs from our showers, drinking fountains, and faucets is something that didn’t just come from a nearby lake or river, but first underwent a cosmic and chaotic journey to get here.
下载应用
AI 为你说出的每个句子打分
TRENDING
热门
关于本节课程
在本节课程中，您将通过分析关于地球水源的知识，来提高您的英语口语水平。您将会学习到与水的来源以及宇宙有关的重要概念，并能有效地应用关键词汇和短语。在这段视频中，演讲者以清晰且富有节奏的方式阐述了复杂的科学内容，这也是您进行英语口语练习的绝佳素材。
关键词汇与短语
- 水分子 (water molecule): 由氢和氧组成的基本单位。
- 氢 (hydrogen): 宇宙中最简单的元素之一。
- 氧 (oxygen): 在星星形成后几亿年才出现的元素。
- 超新星 (supernova): 大质量星体在生命周期末期爆炸时的现象。
- 核合成 (nucleosynthesis): 形成更重元素的过程。
- 大气层 (atmosphere): 包围行星的气体层。
- 陨石 (meteorites): 在地球大气层外的天体。
- 宇宙 (universe): 包含所有物质和能量的广阔空间。
练习建议
在进行这段视频的英語口语练习时，可以采用shadow speech的技巧。首先，慢速播放视频，在了解内容后逐渐加快速度，尝试模仿演讲者的语调和节奏。由于这段演讲的语速适中，您可以轻松跟读。
在练习时，请注意演讲者在介绍复杂概念时的语气变化和重音，这将帮助您在英语口语中更准确地表达。雅思口语练习同样可以从这类内容中受益，因为它们有助于在真实语境中应用新词汇。结合这样的有趣和教育性的内容来进行shadowspeak练习，不只会让您的口语更加流利，还会增加您对相关主题的理解。
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。