learn one's lesson 吸取教训
learn a lesson 接受教训,吸取教训
This is Lesson One 这是第一课
learn sth from one slips 从某人嘴里得知
One is never too old to learn. 活到老，学到老
learn one's lesson from
从...吸取教训，可以这么用
例句：
The boy learned his lesson from the Wolf story.
吸取经验教训
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