the most difficult lesson
最难的一课
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Which lesson is the most difficult in Book Two?
第二册课本里哪课最难?。
youdao
Which lesson is the most difficult in this book?
这本书里哪一课最难？
The last and most difficult lesson is lesson 14.
最后一课即最难的一课是第十四课。
Still, the most important lesson from the trial may be that it is incredibly difficult to tease out the long-term effects of a medicine.
FORBES: Wyeth Lucks Out On Hormone Study
They say they learned that difficult lesson in two of the last three years, when hail destroyed most of their crops.
CNN: farmer plows
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