work on中文意思有“对……有效”、“向……做工作”、“左右”、“动感情”等；work out中文意思有“想出”、“计算出”、“发生”、“完成”、“干满”、“健身”等。work on：表示正在进行一件事情。work out：表示一个抽象的解决的方法。
work on的例句We began work on the project in May.
我们于五月份启动了这项工程。
She is best known for her work on the human brain.
她在对人脑的研究方面最为知名。
We started work on the project in 2002.
我们于2002年开始干这个项目。
Work on the new bridge is due to begin in September.
新桥定于九月份动工。
He made a concentrated effort to finish the work on time.
他全力以赴以按时完成这项工作。
work out的例句Work out at a gym or swim twice a week.
一周去健身房锻炼两次，或游两次泳。
While the lads are golfing, I work out in the gym.
小伙子们打高尔夫球的时候，我在健身房锻炼。
Let's be practical and work out the cost first.
咱们实际一点儿，先计算一下成本费用。
It will take a while for the drug to work out of your system.
这药得需要一段时间才能排出你的体外。
She's full of good intentions but they rarely work out.
她虽然处处出于善意，却往往事与愿违。
