先后次序关系：at this time;first;second;at last;next;previously; simultaneously;eventually;last but not least;to begin with;to start with;to end with;finally;seeing...;since then;first of all;afterwards;following this;preceding this
因果关系：because;because of this;being that;another important factor/reason of... ; since;as;for;in that...; owing to;due to;for the reason that...;in view of;the reason seems to be obvious;there are about...;for this reason;as a result of this;therefore;...and so...; consequently;as a result;thus;hence;so;so that...;in consequence;as a consequence; accordingly;inevitably;under these conditions;thereupon
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