快速
word A2- fast; high-speed; rapid
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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。
而在快速眼动阶段，人往往会做梦，大脑忙着整理当天的记忆，把重要的信息储存起来。
然而，这种快速的技术发展也带来了一些新的社会问题。
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