"跟上"的英文翻译是 "keep up with." 这个短语来源于英语中的一个普通用语，意思是跟随某人或某事物，或者跟踪某事物的发展。

例句：

这个班的学生们都很优秀，我得努力跟上他们的步伐。

(The students in this class are all very good, so I have to try hard to keep up with them.)

时间飞快，我们得尽快跟上最新的发展。

(Time flies, we have to keep up with the latest developments as soon as possible.)

我们得努力跟上世界的变化，不然我们就会被淘汰。

(We have to work hard to keep up with the changes in the world, or we will be eliminated.)