自动电动系统采用产生真空的旋转叶片电动真空泵和电动控制器，以保持准确的真空等级。

Automatic electric systems use rotary vane electric vacuum pumps to create vacuum and an electric controller to maintain the correct vacuum level.

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瓶子里的空气排除后就产生真空。

Exclusion of air creates a vacuum in the bottle.

《牛津词典》

风是由热空气上升产生真空而引起的空气流动。

Wind is a current of air caused by a vacuum caused by hot air rising.

《柯林斯英汉双解大词典》