初中英语作文素材——九类过渡词 　　1.开头常用短语 　　It\'s said that...  据说... 　　As we all know that... 我们都知道... 　　It\'s well known that...  众所周知... 　　As/So far as I know... 据我所知... 　　It is clear/obvious that...  ...是显而易见的