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

 馬赫數 [ㄇㄚˇ ㄏㄜˋ ㄕㄨˋ; ma3 he4 shu4]
 Mach number, multiples of speed of sound used as unit in aeronautics, with 1 Mach = 1224 km per hr
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