There are several different stages of sleep,and they too occur in cycles.
"they too occur in cycles"是什么用法?
人气：265 ℃ 时间：2020-04-29 06:43:43
解答
睡眠有几个不同的阶段,而且也会周而复始地发生.
they指的是stages（阶段）
In cycles(周而复始),
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