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Mach
noun [C] science /mɑːk/ /mæk/
singularMach
pluralMachs
  1. a unit for measuring the speed of an object such as an aircraft in comparison with the speed of sound. For example, Mach 5 is five times the speed of sound. 马赫(速度单位,如5马赫是声速的5倍)
     Synonyms and related words
    Units for measuring speed of movement: acceleration, knot, kph...

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