1.跟不上;落下
2.落后;拖欠
1.to fail to keep up with somebody or something
2.to be late in doing something such as making a regular payment or completing a task
1.My dear friends keep one sentence in your mind that it's easy to fall behind, but it's difficult to catch up with the others.
我亲爱的朋友们在你的脑子里留着一个句子，它是落后容易，赶上别人很难。
2.Girls are superior to boys in math up to the age of nine, but fall behind from then on.
女孩子到九岁时数学一直比男孩子强，但此后便落后了。
3.A week's illness made her fall behind with her study.
得了一星期的病，她在学习上落后了。
4.I make it a rule to read the newspaper every day lest I shall fall behind the times.
我每天读报纸已成为一个惯例，以免落伍于时代。
5.It is therefore important not to offer more than you can afford or to fall behind with the payments you agree.
因此，不要提供超出自己支付能力的款额或者拖延已承诺的付款期限都很重要。
6.Girls, who are superior to boys in math up to the age of nine, fall behind from then on.
那些九岁以前在数学方面比男孩子强的女孩，此后却落后了。
7.Although we fall behind in modern times, is the capacity and capability among the world's leading-edge columns, or you are not so far away.
虽然近代以来我们落后了，但当今已具备相当实力和水准，跻身于世界先进之列，也不是很遥远。
8.They fall behind by an average of over two months in their reading. Richer children actually improve their performance.
在平均阅读时间方面，他们要落后两个多月，而富裕家庭的孩子用这段时间可以更上一层楼。
9.Therefore, I also am diligent study and strenuous training in the ordinary time, train every time I never fall behind with competition.
所以，我平时更是勤学苦练，每次训练和比赛我从不落后。
10.Among the assorted education guarantees is that some pupils who fall behind will be able to get one-to-one catch-up tuition.
为改善教育做出的五花八门的保证当中，也包含着对成绩落后的学生提供一对一的补习辅导。