| 单词 | backswimmer |
| 释义 | backswimmer back.swim.mer AHD: [b²k“sw¹m”…r] D.J. [6b#k7sw!m*]K.K. [6b#k7sw!m+]n.（名词）Any of various aquatic bugs of the family Notonectidae that swim on their backs by means of broadened, oarlike hind legs.仰泳蝽：一种属于松藻虫科的水生虫类，用它们宽阔的、桨状的后腿在水上仰泳 |
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