Mach

n.马赫，马赫数(速度单位，常用于计算飞行速度，1马赫等于音速) 复数：machs 牛津词典 noun 马赫，马赫数（速度单位，常用于计算飞行速度，1马赫等于音速）a measurement of speed, used especially for aircraft. Mach 1 is the speed of sound.a fighter plane with a top speed...