形容词
中文翻译：Unknown
同义词：
['void', 'hollow', 'empty', 'void of']
例句：
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1. The tree was hollow and could be easily broken.
这棵树是空心的，很容易就断了。
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2. The room was hollow and echoed throughout the house.
这个房间是空的，在整个房子里都能听到回声。
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3. The hollow sound of laughter filled the room.
空洞的声音充满了整个房间。