This is a filter applied against a Query Subject.

这个过滤器适用于查询主题。

youdao

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

This is a filter, with the labels being the filter.

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"One of the things that is unique about this filter is even if you didn't have arsenic in the water and you only had iron, this is still a great filter to filter iron, " said David Nunley.

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This used to make me crazy because the point of a spam filter is to make spam go away.

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