Recent weeks and months have taught us a painful lesson.

在最近几个月里，我们从中学到了惨痛的教训。

Hitler expected a short campaign but, like Napoleon before him, was taught a painful lesson.

希特勒希望速战速决，但是，就像在他之前的拿破仑一样，他得到的是痛苦的教训。

It would be a painful lesson in some ways. We might be shocked and saddened by what we saw.

某程度上这是一个痛苦的教训。我们可能会因为我们看到的感到震惊和悲伤。

SEBASTIAN : A painful lesson for malls like Burlington.

SEBASTIAN：对于伯灵顿这样的购物中心来说，这是一个惨痛的教训。

It's a painful lesson that many hospitals, including in the US and UK, will take from COVID-19.

这是包括美国和英国在内的许多医院将从 COVID-19 中吸取的惨痛教训。

The painful lessons of Troy remind us that when  a gift looks too good to be true, it usually is.

特洛伊的惨痛教训提醒我们，当一份礼物看起来好得令人难以置信时，它通常是真的。

When the curtain fell on Gladstone's speech, any student had the right to suppose the drama ended; none could have affirmed that it was about to begin; that one's painful lesson was thrown away.

当格莱斯顿的演讲落下帷幕时，任何学生都有权认为这出戏已经结束了。没有人能肯定它即将开始；那个人的惨痛教训被扔掉了。