If ever they remembered their life in this world it was only as one remembers a dream.

【翻译】假如他们还记得活在这个世界上是个什么样子的话，那恰恰就像是一个人记得做了一场梦。（指生活似梦境一般的快乐。）

【分析】这个句子中的as是连词，意为“像，正如”，引导表语从句。as在这里的用法相当于like, as if, as though。

If ever they remembered their life in this world it was only as one remembers a dream.

等于：

If ever they remembered their life in this world it was only like one remembers a dream.

If ever they remembered their life in this world it was only as if one remembers a dream.

If ever they remembered their life in this world it was only as though one remembers a dream.