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听力等级

教育学习   

2023-12-11   Video
Ancient Hands, Ancient Tools

Keywords:

There was a time when our ancient ancestors' hands had digits that all pointed the same way tipped with claws. But our primate ancestors changed that. We've lost our claws and now have na...

曾几何时,我们的 远古祖先的手有 数字,这些数字都指向 同样,有爪子。 但是我们的灵长类祖先 改变了这一点。 我们已经失去了我们的爪子,现在 有指甲和对生的拇指 这让我们能够抓住东西。 我想知道的是什么...


2023-12-02   Pre-Intermediate
Story - 'Molly Bannaky' Written by Alice Mcgill

Keywords:

This story begins on a cold grey morning in 1683 in England.Molly Walesh sat on the stool,pulling at the udder of a difficult cow.She was a milkmaid.She had to get up very early every morning and go t...

这个故事始于 1683 年英格兰一个寒冷的灰色早晨,莫莉·威尔士 (Molly Walesh) 坐在凳子上,拉扯着一头难缠的奶牛的乳房。她是一名挤奶女工。她每天早上都得很早起床,去谷仓挤奶。拥有这头牛的男人拥有她住的小房子,一栋大得多的房子...


2023-11-30   Pre-Intermediate
Story - 'The Keeping Quilt' Written by Patricia Polacco

Keywords:

When my great grandma Anna came to America.She wore the same thick coatand big boots she had worn when she worked on her family's farm.But her family did not farm anymore.In New York City,her father c...

当我的曾祖母安娜来到美国时,她穿着她在自家农场工作时穿过的那件厚外套和大靴子。但她的家人不再种地了。在纽约市,她的父亲用马车搬运东西。家里的其他成员用布制作了鲜花。每个人都很匆忙,而且非常拥挤,不像在俄罗斯的家乡,安娜在俄罗斯的家里唯一拥有...


2023-11-27   Video
The Evolution of Bipedalism

Keywords:

Walking on two legs marked a huge change for our species. In fact, being almost exclusively bipedal makes us unique among our primate cousins. The question is, how did our ancestors start...

用两条腿走路标记 对我们物种来说,这是一个巨大的变化。 事实上,几乎 独家 Bifoot 使我们 在我们 灵长类表亲。 问题是,您是如何做到的 我们的祖先开始消费 两条腿上有这么多时间? 在埃塞俄比亚发...


2023-11-16   Pre-Intermediate
About the History of the English Language, Part Two

Keywords:

In some areas,the Vikings became so powerfulthey built temporary bases.These temporary bases sometimes became permanent.Later, many Vikings stayed in Britain.Many English words used today come from th...

在一些地区,维京人变得如此强大,他们建立了临时基地。这些临时基地有时会变成永久性的。后来,许多维京人留在了英国,今天使用的许多英语单词都来自这些古老的维京人。诸如“sky”、“leg”、“skull”、“egg”、“crawl”、“lift...


2023-11-14   Pre-Intermediate
About the History of the English Language, Part One

Keywords:

More people are trying to learn English than any other language in the world.English is the language of political negotiations and international business.It has become the international language of sc...

尝试学习英语的人比世界上任何其他语言都多。英语是政治谈判和国际商务的语言。它已成为科学和医学的国际语言。国际条约规定客机飞行员必须说英语。英语是南美洲和欧洲大多数学校教授的主要外语。菲律宾和日本的学童从很小的时候就开始学习英语。英语是包括英...


2023-10-24   Video
Glycolysis

Keywords:

SPEAKER: The sweet, energetic glucose molecule is the energy source providing power for your living cells. Glucose, from the food you eat, is slowly broken down into two pyruvate molecule...

演讲者:甜,高能葡萄糖分子是提供能量的来源吗为您的活细胞提供能量。葡萄糖,来自食物你吃,是慢慢的分为两部分丙酮酸分子,按顺序提取能量称为酶反应糖酵解。糖酵解途径需要能量开始,交付通过化学燃料ATP。主要来源细胞中ATP的含量是线粒体细胞器。...


2023-10-20   Video
Pyruvate Dehydrogenase

Keywords:

MALE: The product of glycolysis. The pyruvate molecule is the source of carbon and electrons for aerobic respiration reactions inside your mitochondria. Pyruvate enters pores on the mit...

男性:糖酵解的产物。丙酮酸分子是碳和电子的来源有氧运动呼吸反应在线粒体内。丙酮酸进入毛孔线粒体膜,并被运输进入内部。连接丙酮酸的反应有氧呼吸由以下人员执行巨大的蛋白质复合体制作多份副本三种类型的酶。第一种酶催化脱羧反应,改造三丙酮酸碳转化为...


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