我没有购买上月的杂志。我必须设法搞到过期的杂志以便能及时补读没读过的文章。 I didn't buy the magazine last month; I must try to get hold of a back number so that I can catch up on the articles I missed.
这个学生要想通过期终考试就必须得加把劲。 That student is going to have to get a move on if he wants to pass his finals.
护照过期是无效的。 A passport that is out of date is invalid.
