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From: MDBG CC-CEDICT Chinese-English Dictionary 漢英字典

 馬赫 [ㄇㄚˇ ㄏㄜˋ; ma3 he4]
 Mach (name)
 Ernst Mach (1838-1916), German physicist
 Mach (aeronautics), unit of speed based on speed of sound = 1 Mach = 1224 km per hr