在宋朝，扇子首次用于扇凉空气。

Fans were first used to cool the air during the Song dynasty.

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但是经验告诉物理学家们不可以打开任何一扇窗子，不然空气就会冲出去，使房间变成真空。

But experience has taught the physicists never to open a window because, when they do, all the air rushes out and leaves the room a vacuum.

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这款在床脚位置添加了消音双页扇的床，清凉的空气可以从头的位置进入并在起气垫作用的柔软的薄膜间循环。

Using extremely quiet dual-fans at the end of the bed, cool air is pulled in from behind your head and circulated through the soft membrane which also ACTS as an air-cushion.

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