名词
中文翻译：中空的
同义词：
['hollow', 'hollowed-out', 'hollow-cored']
例句：
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1. The tree was hollow-cored and could be easily sawed through.
这棵树是空心的，很容易就被锯断了。
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2. The hollow-cored walls of the house are very strong.
这所房子的空心墙非常坚固。
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3. The hollow-cored object is hollow inside.
这个空心物体内部是空的。