whirligig beetle
US /ˈwɜːrlɪɡɪɡ ˌbiːtl/
UK /ˈwɜːrlɪɡɪɡ ˌbiːtl/

1.
豉甲
a type of beetle that typically lives on the surface of water, often swimming rapidly in circles
:
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The pond was full of tiny whirligig beetles, darting and spinning.
池塘里满是小小的豉甲,它们快速地游动和旋转。
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A whirligig beetle can see both above and below the water simultaneously.
豉甲可以同时看到水上和水下。