名词
中文翻译：严肃的空腔
同义词：
['serious defect', 'serious hole']
例句：
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1. The patient's chest had a serious cavity that required immediate surgery.
患者的胸腔有一个严重的空洞，需要立即手术。
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2. The scientist discovered a serious cavity in the sample, which could be a sign of contamination.
科学家在样本中发现了一个严重的空洞，这可能是污染的迹象。
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3. The engineer carefully inspected the cavity to ensure it was properly sealed and not causingany leakage.
工程师仔细检查了空洞，确保它被正确密封，没有泄漏。