这个激光脉冲的持续时间只有几纳秒。

The laser pulse lasts only a few ___ns.

我弟弟用他的NS玩马里奥赛车。

My brother plays Mario Kart on his ___NS.

两组之间的差异不显著(ns)，表明没有统计学意义。

The difference between the two groups was ___ns, indicating no statistical significance.

这条南北高速公路贯穿了整个国家。

The ___NS highway runs through the entire country.