撒哈拉沙漠下面是巨大的含水层，基本上是一片淡水的海洋，那可能是经过岩石层过滤的，已经有一百万年历史。

Beneath the Sahara are huge aquifers, basically a sea of fresh water, that's perhaps a million years old filtered through rock layers.

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未经过滤的咖啡，含有较多的咖啡醇，会升高体内胆固醇含量。

Unfiltered coffees, contain more of a cholesterol-raising substance called cafestol.

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图11按照价格过滤的搜索结果。

Fig. 11: The search results, filtered by price.

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In a compiled language, you have an intermediate step, in which you take the source code, it runs through what's called a checker or a compiler or both, and it creates what's called object code.

而在编译语言里，你就会经过一个中间的步骤，在这种语言里输入源码后，先经过过滤器,或者编译器检查后，它会创建一个叫做目标代码的东西。

麻省理工公开课 - 计算机科学及编程导论课程节选

And actually, a question that might come up, I just explained, the sodium channel, you might say, well, how do potassium channels work then, because I can understand how you can filter something big out, but how do you filter out something small.

实际上，可能大家会问一个问题，我刚解释过，钠离子通道，你可以说，好吧，那么钾离子通道该如何起作用呢，因为我可以理解你是如何把大东西过滤掉的，但是你如何把小东西过滤掉呢？

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The sovereign representative acts, you might say, like a filter for the wills and passions of the people.

而君主代表的行动，就像人民意志和力量的过滤器。

耶鲁公开课 - 政治哲学导论课程节选