Similarly, if it is dusty or there are a lot of other larger particles in the air, this will filter out larger wavelengths, resulting in a red sky and red sun.

同样，如果空气中尘埃比较多，或是空气中有很多其它大颗粒，那么那些较长的光波就会被过滤掉，于是天空就会是红色，太阳也会是红色。

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Filter cotton spray baking room the ceiling can filter out most of the dust, and then stick in the clean air into the baking room.

喷塑烤房顶棚上的过滤棉可以过滤掉大多数的尘埃，然后坚持进入烤漆房内空气的清洁。

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According to the different use of the situation, to clean the air filter, the method can be used in high pressure air from the inside out, the filter dust blowing out.

依据不一样的运用情况，要定时清洁空气滤芯，可运用的办法有高压空气由里向外吹，把滤芯中的尘埃吹出。

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The microscopic whiskers can stop bacteria in a face mask or filter out water droplets in a hospital's air conditioner.

FORBES: Back on Track

Blinds have been installed to remove the need for air conditioning, keeping it cool during the day and allowing excess heat to filter out at night.

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