单词	Mach
释义	MachMach /mæk $ mɑːk/ noun [uncountable] Word Origin WORD ORIGINMach Origin: 1900-2000 Ernst Mach (1838-1916), Austrian scientist Examples EXAMPLES FROM OTHER DICTIONARIES The plane can sustain a speed of Mach 3, or three times the speed of sound. 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:  a plane with a maximum speed of Mach 3
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