I am no physicist, but I imagine you have all blown air over the top of an empty bottle and heard the sound it makes.

我不是物理学家，但我想你们都曾往一个空瓶子的顶部吹过气，并听到过它发出的声音。

youdao

And don't place an empty bottle on the table - it must be placed on the floor.

不要将空瓶放在桌上，一定要放在地上。

youdao

Bring an empty bottle in your carry on to fill at a water fountain and carry on the plane.

那就随身带一个空瓶子，在饮水机上灌满水再带上飞机。

youdao

Among the items retrieved from Mr. Han's body was an empty pint bottle of vodka, the official said.

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Some might recall family trips on which a parent insisted everyone bring an empty plastic bottle because there would be no stops.

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Ms Dent said she would usually have put the drug into an empty methadone bottle but that she did not have any.

BBC: Shaun Binfield and Sally Dent