1、keep up

（與…）齊步前進；不落后（于…）

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

她搖了搖頭開始往前走。他跟了上去。

跟上（變化等）

wage increases which keep up with inflation.

與通貨膨脹同步的工資增長

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

事情變化得太快了，很難跟上形勢。

跟上（活兒、人等）；同…做（或理解）得一樣好

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

為了把活兒干完，彭妮常常午飯時間也要工作。

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

孩子們如果在學校里功課不好，日子就會不好過。

2、exercise

運用;行使

They are merely exercising their right to free speech.

他們只是在行使他們的言論自由權。

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

“賦予我的權力，”總統說，“我將盡責履行。”

活動;運動;鍛煉

She exercises two or three times a week.

她每周鍛煉兩三次。

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

即使你只感到很輕微的胸部疼痛，也不要繼續鍛煉。