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。
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。
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。
The windlass and the well were made of an empty bottle by me. Though it looked rude, my son and his friend played very happily.
空的饮料瓶被我改装成了辘轳和井，尽管做工粗糙，有糊弄之嫌，但儿子和他的小伙伴却玩的津津有味。
The windlass and the well were made of an empty bottle by me. Though it looked rude, my son and his friend played very happily.
空的饮料瓶被我改装成了辘轳和井，尽管做工粗糙，有糊弄之嫌，但儿子和他的小伙伴却玩的津津有味。
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