So can the movement of aphids when, having depleted the young leaves on one food plant, their offspring then fly onward to a different host plant, with no one aphid ever returning to where it started.

蚜虫的运动也是如此，当吃完一株食用植物的幼叶，它们的后代会飞到另一株宿主植物上，没有蚜虫会再回到最初的地方。

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Eventually the girls all graduated from college and went away to work for themselves, but one by one, the daughters returned to work in the family business.

最终，女孩们大学毕业，自己出去找工作了，但这几个女儿却帮家里打理生意。

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Researchers have still to decide whether smell is one sense or two—one responding to odours properly and the other registering odourless chemicals in the air.

研究者们还需要判断嗅觉到底是一种还是两种感觉，一种感觉回应气味本身，另一种感觉记录空气中无味的化学成分。

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In nineteen fifty-one, Navy Admiral Hyman Rickover urged the United States Congress to provide money for the first nuclear-powered submarine.

VOA: special.2010.06.11

I just basically do year-one to the present, it's was nice warm outside, that was the day he was born.

我到现在做了一年，那天户外很晴朗暖和，那天他出生了。

麻省理工公开课 - 媒体、教育、市场课程节选

All right? The first one is, that test has to involve-- shouldn't have to, the value of some variable.

好不好？第一件事是，循环开始的测试必须必须-不是一定，一些变量的值。

麻省理工公开课 - 计算机科学及编程导论课程节选