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1. Oxford American Dictionary

   nanometer

   • IPA[ˈnanəˌmēdər]

   美式

   • n.
     a metric unit of length equal to one billionth of a meter.

   • noun: nanometre, plural noun: nanometres

2. • 相關詞

   nanometre

   • n.
     a metric unit of length equal to one thousand-millionth of a metre.

   Oxford Dictionary