Such an experience befell a certain young girl the first time she was traveling alone.

Question

新概念三册60课二段最后一句话，结构非常奇怪。我的理解是：
1，明显不是定语从句
2，the first time作主句的时间状语，感觉也不对。
3，the first time作she was traveling alone时间状语，这样理解感觉才对
4，the first time she was traveling alone.作为状语修饰限定 certain
这句到底怎么理解才正确？

Answer 1

该句中的the first time相当于一个从属连词 引导时间状语从句，修饰主句中的谓语。类似的相当于从属连词引导时间状语从句的词语还有the moment等
本句意思：当她第一次独自旅行时, 这样的经历就降临到这位年轻的姑娘身上。

Answer 2

Such an experience befell a certain young girl the first time she was traveling alone.
the first time she was traveling alone应该理解为非限制性定语，但去掉了which was 和逗号，这样是对 such an experience 进行评述，即原句是：
Such an experience befell a certain young girl, which was the first time she was traveling alone. the first time 修饰 an experience.
某个年轻姑娘在她第一次独自旅行时，遇到这样的经历。本回答被网友采纳