... first lesson第一节课 hard lesson有难度的课程 important lesson重要的一课 ...
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A Hard Lesson 艰辛一课
hard lesson
沉痛的教训
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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。
Together, they are teaching us a hard lesson: In medicine, nothing comes for free.
FORBES: Scariest Drug Side Effects
It was a hard lesson learned, but here it is: Knowledge is not power.
FORBES: Knowledge Is Power? Those Days are Long Gone
Some experts are therefore saying that the German people may have to learn a hard lesson.
FORBES: A Nuke-Free Germany May Be Forced Into Dirty Embrace With Coal
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