原文地址

so far as I know

as much as one knows about a certain situation and/or at a particular time

一个人对某一特定情况或特定时间的了解。

So far as I know, he won't be back until next month.

据我所知，他等到下个月才能回来。

So far as I know, there is not such a rule in English grammar.

据我所知，英文语法中没有这样一条规定。

So far as I know, they are studying in the same school.

据我所知，他们在同一个学校上学。