one that swims on his or her back; the hemipterous insect Notonecta which swims on the surface of pools.
| 单词 | θ29608 | 
| 释义 | the world > animals > by locomotion > 			[noun]		 > that swims > on the back (1)		 back-swimmer1862 one that swims on his or her back; the hemipterous insect Notonecta which swims on the surface of pools.  | 
	
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