例167　The brain is as active during REM (rapid eye movement) sleep-when most vivid dreams occur-as it is when fully awake, says Dr, Eric Nofzinger at the University of Pittsburgh.

【结构分析】该句子是一个倒装句，句首是间接引语的宾语从句，其主谓结构后置，即says Dr, Eric. 宾语从句的主干是个比较结构The brain is as active during REM as it is when fully awake。两个破折号之间是插入语，做定语从句，修饰REM sleep，即“出现清晰梦境的快速动眼睡眠”。

【亮点回放】此句话的亮点在于比较结构as...as...的成功使用，表示前后一样，比如I am as clever as you are。

【核心词汇】

active　活跃

during REM (rapid eye movement) sleep　在快速动眼睡眠中

most vivid dreams occur　出现清晰梦境

when fully awake　完全清醒时

【参考译文】匹兹堡大学的埃里克博士说，在出现清晰梦境的快速动眼睡眠中大脑和完全清醒时一样活跃。