... portion 部分 fraction 小部分 one-billionth 十亿分之一 ...
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nnosecond one billionth of second 十亿分之一秒
Broadly speaking, nanotechnology describes work on materials whose critical dimensions are measured in nanometers, or one-billionth of a meter.
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Nanotechnology is the science of the very small, where machines and materials are built at the molecular level, and key components are measured in nanometers, or one-billionth of a meter.
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The one-billionth CER was issued on September 7th.
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