There are important lessons to be learned.
我们可以从中得到重要的教训。
There are still lessons to be learned, of course.
当然，依然有些教训。
There are many hard lessons to be learned from life.
生活中有许多严酷的教训要吸取。
The point is: what are the lessons to be learned here?
问题在于：我们在此能够得到什么样的教训？
There are several lessons to be learned from this story.
从这个故事我们可以学到很多。
What I am saying is that there are lessons to be learned here.
我的意思是这样会对大家有所启示。
Lessons can be learned to face the future, though history cannot be changed.
我们可以吸取教训，面对未来，尽管历史是无法改变的。
Lessons can be learned to face the future, although/though history cannot be changed.
虽然历史不能被改变，但是可以学习经验来面对未来。
Certain lessons have to be learned the hard way.
有些教训只有通过这种尴尬的方式才能吸取。
Lessons need to be learned from such tragedies and action taken.
人们需要从这类悲剧和采取的行动中吸取经验教训。
Lessons need to be learned from such tragedies and action taken.
人们需要从这类悲剧和采取的行动中吸取经验教训。
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