十亿分之一米是一纳米。

A nanometre is a billionth of a metre.

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而现在的晶体管尺寸可用十亿分之一米（纳米）计算。

Now the size of transistors is measured in billionths of a metre.

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其间距离大约为300纳米时(1纳米是十亿分之一米)，秋千开始移向小球。

At a distance of about 300 nanometres (a nanometre is a billionth of a metre), the seesaw began to tilt towards the ball.

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