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The particles were smaller than a micron and invisible to the naked eye.
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The particles were smaller than a micron and invisible to the naked eye.
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Related words
micron
IPA(Pronunciation)
Noun
figuratively
Japanese Meaning
（物理学）1ミリメートルの1000分の1、または1メートルの100万分の1の長さ（極めて小さな単位） / （比喩的に）非常に微小な量
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