顺序关系：

　　first;

　　second;

　　thirdly;

　　next;

　　then;

　　at the outset，

　　following this;

　　at this time;

　　now;

　　at this point;

　　after;

　　afterward;

　　after this;

　　subsequently;

　　lastly;

　　finally;

　　consequently;

　　before this;

　　previously;

　　preceding this;

　　simultaneously;

　　concurrently.