英语语法分析

That precise characterization allowed them to target molecules with laser pulses lasting for one-quadrillionth of a second, or just long enough to set single electrons spinning.

在先前的研究中得到其原子水平上的结构，精确的结构特性允许他们用激光脉冲瞄准目标分子，并且只持续千万一份之一秒以使分子处以单电子自旋状态。

A femtosecond laser pulse lasts on the order of a quadrillionth of a second but reaches a peak power equivalent to that of the entire power grid of North America during its short burst.

这种飞秒激光脉冲持续兆分之一秒(千万亿分之一秒)的时间，但是在其短暂的持续时间内，功率峰值可以达到北美电网功率相当的水平。