(often followed by a number 常后接数字 a measurement of speed, used especially for aircraft. Mach 1 is the speed of sound. 马赫，马赫数（速度单位，尤用于计算飞行速度，1 马赫等于音速） a fighter plane with a top speed of Mach 3 (= 3 times the speed of sound) 最高速度为 3 马赫的歼击机
Word Origin1930s: named after E. Mach (1838-1916), Austrian physicist and philosopher of science.
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