单词 notonectidae 例句 DEFINITIVE EXAMPLES 权威例句〔backswimmer〕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...