learn hear understand

learn hear understand 在某种特定情况下,都可作"懂得,明白"之意,请问它们的具体区别在哪里呢?以下几题分别用哪个词更准确?谢各知识人士帮忙解答:The road in the rush hour is so dangerous . But the pedestrians do not always ______ it .I ______ that the weather will get colder and colder . So you'd better go to school by bus instead .

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understand作"懂得,明白"，例如： ——Understand? ——Yes,I see.The road in the rush hour is so dangerous . But the pedestrians do not always understand it .learn 另外一个意思是“获悉”“听说”，这时不用hear（听见了）。 I learn that the weather will get colder and colder . So you'd better go to school by bus instead .