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1. Oxford Dictionary

   micrometeoroid

   • IPA[ˌmʌɪkrə(ʊ)ˈmiːtɪərɔɪd]

   英式

   • n.
     a microscopic particle in space or of extraterrestrial origin which is small enough not to burn up in the earth's atmosphere but to drift to the surface instead.

   • noun: micrometeoroid, plural noun: micrometeoroids

2. • 更多解釋

   micrometeoroid

   • IPA[ˌmīkrəˈmēdēəˌroid]

   美式

   • n.
     a microscopic particle in space or of extraterrestrial origin that is small enough so that if ...

   Oxford American Dictionary