as a result 、therefore 、since、for 、for this reason 、so、because、consequently 、as、thus
表示序列关系
first 、before 、first of all、on the right/left、next、to begin with、turnright/left 、afterward、meanwhile、second、 last but not least 、for a start、third、finally、 until、between 、firstly 、subsequently、then 、secondly 、previously、in themiddle 、for one thing、 for another、after 、in the first place