A MERV rating tells you how well the filter can remove pollen and mold from the air as it passes through.

MERV 等级可以让你知道当花粉和霉菌在空气中传播时，过滤器将如何将之过滤。

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In using absolute filters, all particles larger than the micron rating of the filter element in use will be removed from the treated fluid.

在高纯度过滤器使用过程中，大于滤芯微米额定值的所有颗粒都将从处理液中被去除。

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If you have an iPhone, iPod Touch , or iPad , Apple provides tools to disable in-app purchases, to stop apps from being downloaded, and you can invoke a rating system filter, and much more.

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"No filter is 100% accurate, " said Stephen Balkam, chief executive of the Internet Content Rating Association.

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