And I have actually seen evidence over the years, mercifully, just a small amount of evidence, but there are, in a group like this, always a few students who come in with a really strong background in high school.

这几年我已经见到了实例，令人感激的是，只有小部分人，但在这，像这样的一个小组，总有一些来到我们这的学生,在高中打下了良好的基础。

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And lightning strikes again and the lights go out.

突然一道闪电打下来，灯全都灭了。

I'm afraid of 课堂 - SpeakingMax英语口语达人

It's like we have laws of thermodynamics that underlie the use of engines, but you can't just go from the laws of thermodynamics to an automobile; there are a million steps along the way.

这就好比热力学定律,为引擎的使用打下了理论基础,但你不能从热力学定律一步跨越到发明汽车,这中间还要经历成千上万的步骤

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Alexander H. Stephens, a Georgian, a slaveholder, said the cornerstone of the Confederacy, the cornerstone of their political movement, was what he called "American Negro slavery."

亚历山大· H·斯蒂芬斯,一个来自乔治亚州的奴隶主,用他的演讲为邦联打下了基石,这块邦联政治运动的基石,被他称为,"美国的黑人奴隶制度"

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