名词
中文翻译：空洞
同义词：
['cavity', 'cavity', 'hollow', 'void']
例句：
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1.The patient had a cavity filled with gold.
病人的牙齿被填充了黄金。
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2. The engineer found a cavity in the wall that needed to be repaired.
工程师发现墙壁里有需要修复的空洞。
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3. The scientist discovered a cavity in the earth's crust that could hold water.
科学家发现了地球地壳中的一个空洞，里面可以储水。