Mach /mæk $ mɑːk/ noun [uncountableU] a unit for measuring speed, especially of an aircraft, in relation to the speed of sound. Mach 1 is the speed of sound, Mach 2 is twice the speed of sound etc 马赫,马赫数〔速度单位,尤用于计算飞行速度,一马赫等于音速〕 a plane with a maximum speed of Mach 3 最大飞行速度为3马赫的飞机
Mach• The plane can sustain a speed of Mach 3, or three times the speed of sound.