1·Exclusion of air creates a vacuum in the bottle.
瓶子里的空气排除后就产生真空。
—— 《牛津词典》
2·The vacuum flask has a strong casing, which won't crack or chip.
这个真空瓶有一个坚固的外壳，不会破裂。
—— 《柯林斯英汉双解大词典》
3·Wind is a current of air caused by a vacuum caused by hot air rising.
风是由热空气上升产生真空而引起的空气流动。
—— 《柯林斯英汉双解大词典》
4·The dust is drawn into the vacuum cleaner.
灰尘被吸入了真空吸尘器。
5·Now we let the volume expand into the vacuum on the other side.
现在我们让体积膨胀到另一边的真空中。