同根派生 英汉例句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.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 am not entirely a back number, Taylor.泰勒，我还不是一个毫无力量的人。