adj.第十億的；十億分之一的
n.第十億；十億分之一
One NM is one-1 billionth meter. 一納米是十億分之一米。
Some seismometers are capable of detecting ground motion as small as 1 billionth of a meter,or about 40 billionth of an inch. 一些地震檢波器能探測相當(dāng)于十億分之一米或億分之四英寸的地面運動。
