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åµæ¯:æ修饰çè¯å¨ä»å¥ä¸ä½ä»è¯å®¾è¯æ¶,ä»è¯å¯æå,ä¹å¯æ¾å¨åä½ç½®.
This is the pen which I wrote the letter with.==
This is the pen with which I wrote the letter.
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They are the children whom my mother takes care of.è¿å¿çofå°±ä¸è½å¨,å 为take care ofæ¯ä¸ªåºå®çè¯ç»,ofä¸careä¸å¯åå¼ç.
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