我们心理上的当下是三秒钟。

Our psychological present is three seconds.

三秒钟规则是一个简单的技巧。

One easy technique is the three-second rule.

你要按著那个按键大约三秒钟。

You need to hold down the button for about 3 seconds.

可是三秒钟后我径自离开，再不回头看上一眼。

But three seconds later I'm gone, never to return again.

他比劲敌乔纳松·福特快约三秒钟完成了漫长的赛程。

He completed the lengthy course some three seconds faster than his nearest rival, Jonathon Ford.