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单词 water boatman
释义

WordReference Random House Unabridged Dictionary of American English © 2024
water boat′man, 
  1. Insectsany of numerous aquatic insects of the family Corixidae, having paddlelike hind legs. Also called boat bug. 
  • 1805–15

Collins Concise English Dictionary © HarperCollins Publishers::
water boatman n
  1. any of various aquatic bugs of the families Notonectidae and Corixidae, having a flattened body and oarlike hind legs, adapted for swimming
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