另外，不需要把它藏在后屋，在那里过滤效果会减弱。

Plus there's no need to hide it in a back room, where it would be less effective.

youdao

这款口罩可以多次清洗，且不会损失过滤效果。

The mask is washable many times with no loss of filtration effectiveness.

youdao

若将铁磁体放入共振穿隧二极体中，可以放大过滤效果。

The filtering effect could be amplified by placing the ferromagnet in a resonant tunnel diode.

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