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  1. transmittance

    • IPA[tranzˈmɪt(ə)ns]

    英式

    • n.
      the ratio of the light energy falling on a body to that transmitted through it.
    • noun: transmittance, plural noun: transmittances

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    • IPA[ˌtranzˈmitns]

    美式

    • n.
      the ratio of the light energy falling on a body to that transmitted through it.

    Oxford American Dictionary