长难句: Neither kind of sleep is at all well understand, but REM sleep is assumed to serve some restorative function of the brain.
结构剖析: 本句的两个部分之间以 but 连接, 表示转折关系。难点之一 是两个部分都是被动语态,尤其是第二部分,可以转换成主动语态:but scientists assume that REM sleep serve some restorative function of the brain. 难点之二是 neither 作形容词,修饰 kind ,后面的谓语用单数。
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