She learned her lesson after getting a speeding ticket and now drives carefully.

learned 是动词 learn 的过去式，learn 的意思是"学习、认识到"。 her 是代词 she 的所有格形式，意思是"她的"。 lesson 的意思是"课程、教训"，这里指从错误中获得的经验。 learned her lesson 是一个固定短语，意思是"吸取教训"，指从错误或失败中获得经验并改变行为。