动词短语
中文翻译：在屋顶下挖掘
同义词：
['roof digging', 'roof excavation', 'roof work', 'roof tunneling']
例句：
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1. They were doing a roof caving project in the backyard.
他们在后院做屋顶挖掘项目。
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2. The workers had to do some roof caving before they could start building.
工人们必须先进行一些屋顶挖掘才能开始建造。
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3. He was worried about the safety of the workers who were doing roof caving on the constructionsite.
他担心在施工现场进行屋顶挖掘的工人的安全。