learn:
vt.
1. 学习;学会[+to-v][+v-ing][+wh-]
2. 认识到[Y][+(that)]
3. 记住
4. 得知,获悉[+(that)][+wh-]
5. 【幽】教训
vi.
1. 学,学习[(+from)]
2. 得知,获悉[(+of/about)]
learn from:
1. 从...中吸取教训
We should learn from his mistakes.
我们应该从他的错误中接受教训
learn about:学习，了解
learn of:1. 获悉
We learned of her illness only yesterday.
我们昨天才听说她病了
learn:学习
learn from:从……中学到
learn about:学习，了解
learn of:获悉
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