把窗户开启，让室内空气清新；

Ten, open the window, so that the indoor air fresh;

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刮风下雨时，也可开启窗户，保持室内空气清新。

The Windows can also be opened in windy and rainy days to keep the air in the room fresh.

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这样做可以使潮湿的、废旧的空气逸散，同时保持室内空气清新。

It lets some of the built up humidity escape and allows an exchange of stale inside air for air from the fresh outdoors.

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