More generally: a hollow or depression forming part of various structures and devices.
| 单词 | θ99244 | 
| 释义 | the world > space > shape > curvature > curved surface > 			[noun]		 > concavity > concave place or area > hollow or depression as part of structure (1)		 pan1611 More generally: a hollow or depression forming part of various structures and devices.  | 
	
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