A hard lesson certainly, but also a shocking wake up call.
它的确是一个沉重的教训，但也是一次令人难忘的警钟。
It is a hard lesson to learn, but we must all learn it.
学习这一课并不容易，但却是我们所有人的必修课。
If we have a hard lesson today, let us strive to learn it well and then we shall be prepared for a harder one tomorrow.
假如我们今天功课上遇到一个难题，让我们竭力解决它，然后我们就可以作好准备应付明天更大的难题。
If we have a hard lesson today, let us strive to learn it well and then we shall be prepared for a harder one tomorrow.
假如我们今天功课上遇到一个难题，那就让我们竭力解决它，然后我们就可以做好准备应付明天更大的难题。
He told me that this drought has taught him a hard lesson: it is too difficult to keep animals.
他告诉我干旱给了他一个沉痛的教训：饲养动物太困难了。
In the course of exploration, he made a detour, and there was a hard lesson, but also made some very valuable ideas.
在探索过程中，他走过弯路，有过沉痛的教训，但也提出了一些极其宝贵的新思想。
And this was the first hard lesson that Obama learned in Chicago: most of these ministers weren't willing to cooperate with each other.
然而这是奥巴马在芝加哥所学到的第一个沉痛的教训：大部分牧师长都不愿意与彼此合作。
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