In adolescence, I hated life and was continually on the verge of suicide, from which, however, I was restrained by the desire to know more mathematics.

请问：from which做什么成分？which指的是什么？

【答】

1. restrain约束；限制；阻止。常与from 连用：

We must not restrain children from their liberty.

我们绝对不要限制孩子们的自由。

2. from which之后为非限制性定语从句，however是插入语。from which I was restrained by the desire to know more mathematics.

3. which指代on the verge of suicide（自杀的边缘）。