in the corner:在里面的拐角处：比如说屋里面的拐角处有一张桌子
There is a table in the corner of the house
on the corner:在拐角之上。如在桌子角上放着个杯子
There is a cup on the corner of the table
at he corner:在拐角外面，如问路回答：请在前面的拐角处左拐
Please turn left at the corner of the house.
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