used to say what you think is true, although you do not know all the facts

He isn't coming today, as far as I know. 据我所知，他今天不来。

As far as I know, there is no evidence to back up his claims.

I asked him to give her some money, and as far as I know, the matter was taken care of.

I haven't seen Ray for years, but so far as I know, he's still alive.

So far as I know, her students were unaware of the incident.

See also: far adverb (DISTANCE)