keep

up

with

动词词组，跟得上，不落后的意思。

You

are

walking

too

fast.

I

cannot

keep

up

with

you.

你走得太快了，我跟不上你。

We have

to

work

hard

to

keep

up

with

the

pace

of

the

age.

我们必须努力，才能跟上时代的脚步。