我们可以见到杯子里有空气，当我们把水倒下去，空气会跑出来，而水会进到里头去。
We can see that there is air in the glass. When we pour water into it, the air goes out and the water is in it instead.
我们可以见到杯子里有空气，当我们把水倒下去，空气会跑出来，而水会进到里头去。
We can see that there is air in the glass. When we pour water into it, the air goes out and the water is in it instead.
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