bombardier beetle
noun
1- a ground beetle that discharges a puff of irritant vapour from its anus with an audible pop when alarmed放屁甲虫（遇到危险时会发出臭气与响声）。
1.1
- Several species in the family Carabidae, in particular the European Brachinus crepitans.步甲科, 数种, 尤指欧洲的气步甲。