1、keep up

（与…）齐步前进；不落后（于…）

She shook her head and started to walk on. He kept up with her.

她摇了摇头开始往前走。他跟了上去。

跟上（变化等）

wage increases which keep up with inflation.

与通货膨胀同步的工资增长

Things are changing so fast, it's hard to keep up.

事情变化得太快了，很难跟上形势。

跟上（活儿、人等）；同…做（或理解）得一样好

Penny tended to work through her lunch hour in an effort to keep up with her work.

为了把活儿干完，彭妮常常午饭时间也要工作。

Life is tough for kids who aren't keeping up in school.

孩子们如果在学校里功课不好，日子就会不好过。

2、exercise

运用;行使

They are merely exercising their right to free speech.

他们只是在行使他们的言论自由权。

The powers delegated to me, the President said, will be exercised with due responsibility.

“赋予我的权力，”总统说，“我将尽责履行。”

活动;运动;锻炼

She exercises two or three times a week.

她每周锻炼两三次。

Never keep on exercising if you have even the slightest chest pain.

即使你只感到很轻微的胸部疼痛，也不要继续锻炼。