里面充满空气
It is full of air inside.
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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.
youdao
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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