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in一般指大地方.如:in Beijing, in New York 而at一般指小地方: at school, at the door, at the gate . on一般不用于地方前. 另外,在方向前也有用in, on, to三个介词的: in是指在范围之内, 如:Shanghai is in the east of China. on是指相临的状态:如: Russia is on the north of China. to是指相离的状态:如: Japan is to the east of China. |
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