核心问题
请辨析 learn of 与 learn off 的用法。
词典解答
learn of 可作“向……学习”“听说”解：
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Teach me at once, and learn of me to die. 马上来教我，你再来向我学习如何死去。
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His mother learnt of her son's success in the newspapers. (LDCE) 他母亲从报纸上得知儿子成功的消息。
learn off 则作“背熟”“记熟”解：
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He has learned the poem off. (EPV) 他把这首诗背下来了。
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Actors have to learn their words off in a very short time. 演员必须在很短的时间内背熟台词。