The resulting laser-machined holes have a much higher aspect ratio (diameter to depth ratio) than holes achieved with standard fabrication techniques.

激光加工产生的孔比标准制造技术有更高的直径深比。

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The holes are only borings, less than a foot in diameter.

这些洞只不过是一些钻孔，直径不到1英尺。

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They create a series of pores ranging from 5 to 25 nm in diameter by placing flakes of graphene over a silicon nitride membrane and drilling nanosized holes in the graphene using an electron beam.

通过将石墨烯薄片放置在一个氮化硅薄膜上，并用电子束在石墨烯上打出纳米尺度的孔，他们制作出了一系列从5到25nm直径的孔。

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Although no drill has been found, archaeologists have discovered beads of the same 2.5mm diameter as the holes found in the teeth, indicating the people did have the capacity to do delicate work.

BBC: Prehistoric dentistry evidence found

The men have been trapped in the desert copper-and-gold mine since an August 5 cave-in and are surviving on supplies funneled to them from above ground through three bore holes, each about 4 inches in diameter.

CNN: New video shows trapped Chilean miners in good spirits

Two bore holes -- each about 8 centimeters in diameter -- are currently being used to supply the miners.

CNN: STORY HIGHLIGHTS