work on中文意思有“對……有效”、“向……做工作”、“左右”、“動感情”等；work out中文意思有“想出”、“計算出”、“發(fā)生”、“完成”、“干滿”、“健身”等。work on：表示正在進行一件事情。work out：表示一個抽象的解決的方法。

We began work on the project in May.

我們于五月份啟動了這項工程。

She is best known for her work on the human brain.

她在對人腦的研究方面最為知名。

We started work on the project in 2002.

我們于2002年開始干這個項目。

Work on the new bridge is due to begin in September.

新橋定于九月份動工。

He made a concentrated effort to finish the work on time.

他全力以赴以按時完成這項工作。

Work out at a gym or swim twice a week.

一周去健身房鍛煉兩次，或游兩次泳。

While the lads are golfing, I work out in the gym.

小伙子們打高爾夫球的時候，我在健身房鍛煉。

Let's be practical and work out the cost first.

咱們實際一點兒，先計算一下成本費用。

It will take a while for the drug to work out of your system.

這藥得需要一段時間才干排出你的體外。

She's full of good intentions but they rarely work out.

她雖然處處出于善意，卻往往事與愿違。

來源：高三網(wǎng)