A filter is designed to reject some substances, while permitting others to pass through.

VOA: special.2010.01.05

Once you can see it and once you can step back from it, then you can also decide, "This pass is my filter. This pass is my constraint.

一旦你看到了它，一旦你能退一步思考它，你就能决定，这么走可以去伪存真，这么走会遇到困难。

斯坦福公开课 - Twitter之父Jack.Dorsey演讲：好奇和灵感的力量课程节选

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？

麻省理工公开课 - 化学原理课程节选

The original design of the ceramic filter came from a chemist in Guatemala,Fernando Mazariegos.

VOA: special.2009.06.22

Ultimately, we need a filter or a lens to talk about then what is ultimately in control.

最终，我们需要一个视窗，一个镜头,来讨论什么是最终的控制者。

普林斯顿公开课 - 人性课程节选

These holes let water slowly pass through the walls of the filter.

VOA: special.2009.06.22

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

In simple terms, think of snow or ice as a filter.

VOA: special.2010.01.05

Your natural defenses that might provide some kind of a buffer between a commercial message and your behavior, you have a filter, a screen that helps you interpret these message.

人天生的防御心理能够,为商业信息和人类行为之间提供缓冲,电视屏幕像一个过滤器那样,隔离了人和商业信息

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Tests have shown that the filter produces safe drinking water.

VOA: special.2009.06.22

What all of these channels have is what's called a selectivity filter, so this filter filters out the type of ion that's going to be allowed through.

这些离子通道都有的一部分,就是所谓的选择性过滤器，这个过滤器,会滤过允许穿过的离子。

麻省理工公开课 - 化学原理课程节选

The water filter costs little to make.

VOA: special.2009.06.22

And there's two parts of the filter.

这个过滤器由两部分组成。

麻省理工公开课 - 化学原理课程节选