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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。