又一次教训。
又一次，约翰在池塘遭遇了不幸。我来告诉你是怎么样的，这样你就可以从他的过失获得教训。
Once John came to grief in this pond. Let me tell you how it was, that you may learn a lesson from his mistake.
这是一个教训，人类已经学会一次又一次的例子，这是我们两国之间的历史。
That is a lesson that human beings have learned time and again, and that is the example of the history between our nations.
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