| 单词 | backswimmer |
| 释义 | backswimmer in British English (ˈbækˌswɪmə) noun an aquatic bug belonging to the family Notonectidae that swims on its back using its back legs as oars backswimmer in American English (ˈbækˌswɪmər) noun any of a family (Notonectidae) of hemipterous water bugs that swim rapidly on their back by use of their long, oarlike legs |
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