water bug

US /ˈwɑː.t̬ɚ ˌbʌɡ/
UK /ˈwɑː.t̬ɚ ˌbʌɡ/
"water bug" picture
1.

水生昆虫, 水虫

any of various insects that live in or on water, especially a large aquatic bug (family Belostomatidae) that can inflict a painful bite

:
I saw a large water bug swimming in the pond.
我看到一只大水生昆虫在池塘里游泳。
Some people confuse cockroaches with water bugs.
有些人把蟑螂和水生昆虫混淆。