如果你在一只气球里充满空气，把它扎紧，然后放到火炉旁边给它加热，气囊里面的空气会剧烈地膨胀，以致最后爆裂，发出巨大的响声。

If you put a bladder that is filled with air and tied up, into the pipe of a heated stove, the air inside will expand so much as to burst the bladder with a loud report.

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因为现在里面空空洞洞，充满空气。

For now they're bare and full of air.

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因为现在里面空空洞洞，充满空气。

For now they're bare and full of air.

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