问题描述：
as在句子中的作用
The brain is as active during REM(rapid eye movement)sleep-when most vivid dreams occur-as it is when fully awake,say Dr.Eric Nofzinger at the University of Pittsburgh.求助这句话中两个as的作用,
The brain is as active during REM(rapid eye movement)sleep-when most vivid dreams occur-as it is when fully awake,say Dr.Eric Nofzinger at the University of Pittsburgh.求助这句话中两个as的作用,
问题解答：
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