而是
word B1- rather
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科学家发现，睡眠并不是一种单一的状态，而是由浅睡、深睡和快速眼动睡眠组成的周期。
在我看来，城市绿地绝不是可有可无的点缀，而是城市生活的必需品。
清晨醒来，许多人做的第一件事不是洗漱，而是拿起枕边的手机。
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