The Army chief,General Scott, warned Lincoln that it was too late to get supplies to Fort Sumter.

VOA: special.2009.08.06

So you're clobbering the value of X and then you can't get back X's value because it's too late.

所以你们清除了X的值,然后你们不能找回X的值了，因为太晚了。

哈佛公开课 - 计算机科学课程节选

or be certain that you know how to get home if it's late

或者很晚的时候，要保证你知道回家的路，

伦敦的夜生活 - SpeakingMax英语口语达人