②主句的主干为"主语（I） + 谓语（knew）"。that（第一个）引导宾语从句，In a flash作时间状语。

③在宾语从句中，that（第二个）引导定语从句，修饰________。

【句意】一瞬间我明白了这个词便是我头脑中正在进行的这个过程的名称。

【仿写】一瞬间我意识到了这个村庄就是经常出现在我梦里的地方。

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答案

1. 【分析】 时间

【仿写】 The problem had troubled Louis for a long time but he suddenly found the solution while having a talk with his friends.

2. 【分析】 name of the process

【仿写】In a flash I realised that the village was the place which / that constantly appeared in my dream.