广播(announce)通常如此(as is often the case)报道(report)发生（happen）的事，说说(say)提到（mention）看到(see)的，期盼(expect)知道(know)的。

如：As is known to us 众所周知

As is reported in the newspaper.正如报纸报道的

As is expected正如期盼的

As is said above 综上所述

as is mentioned above(正如上面所提到的)

as often happens(正如经常发生的那样)

as is often the case (通常如此)

David, as you know, is a photograopher. 戴维是个摄影师，你是知道的。(不可用which)

Li Ming is late, as is often the case. 李明迟到了，这事是经常发生的。(不可用which)