问题描述：
判断下列句子中while的含义：
1、Jane was dressed in brown while Mary was dressed in blue.
2、While I admit that the problems are difficult,I don't agree that they cannot be solved.
3、He fell asleep while(he was) reading a grammar book.
1、Jane was dressed in brown while Mary was dressed in blue.
2、While I admit that the problems are difficult,I don't agree that they cannot be solved.
3、He fell asleep while(he was) reading a grammar book.
问题解答：
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