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Mǎhè
马赫字 		Mach (name); Ernst Mach (1838-1916), German physicist; Mach (aeronautics), unit of speed based on speed of sound = 1 Mach = 1224 km per hr;馬赫字
Mǎhèshù
马赫数字 		Mach number, multiples of speed of sound used as unit in aeronautics, with 1 Mach = 1224 km per hr;馬赫數字

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