transonicWiktionary 原文英美构词拆解trantran-前缀sonicsonic词干tran-Alternative form of trans- (“across, beyond”).词源说明From tran- + sonic.释义形容词adjective1Just below, or just above, the speed of sound (0.8 < Ma < 1.2 approximately).2Passing from subsonic to supersonic, or vice versa.3Travelling through a fluid (commonly air