单词：Butte City
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Snow 雪 Snow comes from clouds, and it is made of snowflakes. 雪从云里来，它是由雪片形成的。 As snowflakes grow bigger and heavier in the cloud, they fall toward the ground. 当云中的雪片变得更大、更重时，它们就会落向
与美国小学生一起学英文第1册
Here's the key part. 接下来是关键的部分。 The solution nearest the wall spins faster than the solution closer to the middle. 离试管壁最近的溶液，要比中间的溶液旋转得更快。 That difference in velocity creates sheer str
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Of all the plastic produced since the 1950s, less than 10% has been recycled. 20世纪50年代以来，产生的所有塑料中，只有不到10%得到回收。 The vast majority ends up being dumped, most of it in landfill. 其中大部分都成了垃
经济学人科技系列
Let's begin by looking at what we currently understand about the neuroscience of Alzheimer's. 让我们先看看目前神经学上对老年痴呆的了解。 Here's a picture of two neurons connecting. 这是一张两个神经元连接的图。 The p
TED演讲国际问题篇
Marine Mammals Since there is such an abundance of food in the sea,it is understandable that some of the efficient, highly adaptable, warm-blooded mammals that evolved on land should have returned to the sea.Those that did have flourished. Within abo
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