更换空调通风口的过滤器。这些过滤器是灰尘和花粉的“吸铁石”。

Change the filters on your air-conditioning vents. These filters are dust and pollen "magnets".

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开始时所有这些过滤器属性都是可选的。

Initially all these filter properties were optional.

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使用这些过滤器为要显示的实例指定条件。

You use these filters to specify criteria for which instances to display.

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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