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问题: reach

In stage four,usually reached after an hour,the slumer is so deep that,if noe awoken,the sleeper would e confused and disorientated.
我想知道这里 usually reached after an hour 是属于整个句子的一个什么语法结构 为什么是使用的过去分词而不是进行时?

解答:

插入语, 说明. 因为是过去, 一定是到了第四阶段才进入第四阶段里.