transonic speed
Technical term in aerodynamics referring to speeds near the speed of sound, typically Mach 0.8–1.2.
遷音速領域では衝撃波が発生しやすい。
Shock waves tend to form in the transonic speed range.
Compound of 遷 (transition) + 音速 (speed of sound), referring to the transitional speed range around Mach 1.