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micrometer

noun
/maɪˈkrɒmɪtə(r)/
/maɪˈkrɑːmɪtər/
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  1. (US English)
    (British English micrometre)
    (symbol μm)
    a unit for measuring length, equal to one millionth of a metre螺旋测微器;千分尺
  2. a device used for measuring very small distances or spaces螺旋测微器;千分尺

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