形容词
中文翻译：空的
同义词：
['hollow', 'hollowed-out', 'void例句：1. The tree was hollow', 'and the wood inside was rotting away.（那棵树是空心的，里面的木头正在腐烂。）']
例句：
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1. The tree was hollow, and the wood inside was rotting away.
那棵树是空心的，里面的木头正在腐烂。
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2.The room was hollow, with no walls to support it.
房间是空心的，没有墙来支撑它。
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3.The hollow sound of the bell echoed through the empty hall.
钟声空洞地在空荡荡的大厅里回响。