（1）表示时间的连接词
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.
（2）表示顺序的连接词
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.
