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Nanocrystals, also known as quantum dots, are semiconducting particles with a diameter of a few millionths of a millimeter.

纳米晶体，也被称为量子点，是一种直径只有百万分之一毫米的半导体粒子。

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They have built robots that can recognize the error of a machine panel by a fraction of a millimeter in a controlled factory environment.

他们已经制造出能够在受控的工厂环境中识别出几分之一毫米误差的机器人。

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The layers are very thin-usually one-fifth or one-tenth of a millimeter.

VOA: special.2010.10.29

The gap could be about one ten-thousandths of a millimeter wide.

这个缝隙大约只有0.1微米那么宽

耶鲁公开课 - 心理学导论课程节选

We didn't have that in the eight-millimeter days. We had to lug a projector, we had to plug it in to somebody's wall, put up a screen and show it to someone patient enough to sit there for five minutes and watch.

VOA: special.2011.06.20

It weighs 7.5 ounces and is about a millimeter thinner than the current Kindle Touch.

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At this game, in which the playing field is measured in hundredths of a millimeter, Lange excels.

FORBES: It's About Time

But, at 66mm (2.6 inches) wide, it's actually a fraction of a millimeter narrower than the most recent Bold.

ENGADGET: BlackBerry Z10 review Mobile