名词
中文翻译：Unknown
同义词：
['inflate', 'expand', 'bulge', 'puff up', 'inflate']
例句：
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1. Theballoon was expanding when it hit the ground.
气球落地时正在膨胀。
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2. The car tires are bulging because of the heavy rain.
因为大雨，汽车轮胎开始膨胀。
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3. The air inside the balloon is inflating, and soon it will burst.
气球内的气体正在膨胀，很快就会爆炸了。