时间
　　later, next, then, finally, at last, eventually, meanwhile, from now on, at the same time, for the time being, in the end, immediately, in the meantime, in the meanwhile, recently, soon, now and then, during,nowadays, since, lately, as soon as, afterwards,temporarily, earlier, now, after a while.

　　顺序
　　first, second, third, then, finally, to begin with, first of all, in the first place, last, next, above all, last but not the least, first and most important.

　　可能
　　presumably, probably, perhaps.

　　解释
　　in other words, in fact, as a matter of fact, that is, namely, in simpler terms.

　　递进
　　What is more, in addition, and, besides, also, furthermore, too, moreover, furthermore, as well as, additionally, again.