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名词下部; （动物）下体，（飞机机身的）腹部
underpart
1. 下体：underpants 衬绔 | underpart 下体 | underpay 不充份地付
noun
1. a part lying on the lower side or underneath an animal's body
e.g. the warbler has a white throat and underparts a woodland mouse with white underparts