如果我们不让空气进入铃罩，铃罩中的电铃一定会因缺少介质而不响了。

If air weren't admitted into the bell jar the electric bell in the bell jar would not ring because of a lack of a medium.

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如果我们不让空气进入铃罩，铃罩中的电铃一定会因缺少介质而不响了。

If air weren't admitted into the bell jar, the electric bell in the bell jar would not ring because of a lack of a medium.

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在没有空气的情况下，物体的速度只取决于下落的时间而不取决于物体的重量。

In the absence of air, the speed of the body depends only on the time of the fall, and does not depend on the body's weight.

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