从事于……；致力于……
to exert effort in order to do, make, or perform something
同义词： work on
... work out 进行锻炼，训练，解决，计算出，拟定（计划、方案），（计划等）顺利进行或有好结果 work at 从事于，钻研 work on 继续工作，从事于，搞……研究 ...
... word for word一字不改地；一字不变地；逐词地 work at从事；在…用功 work on对…起作用；对…发生影响；向…做工作；使兴奋；左右 ...
work at 意为"学习；研究；写作；致力于" work on 表示"从事(某项工作)"，可以译为"造；创 ..
... without exception 一概；全部；无一例外 work at 从事；在...用功 work on 对...起作用；对...发生影响；向...做工作；使兴奋；左右 ...
从事于……；致力于……
I do some voluntary work at the local hospital.
我在当地医院从事一些义务性工作。
I was out of work at the time.
那时我失业了。
I go to work at 8 o'clock.
我8点钟去上班。
He did his award-winning work at the Chinese University of Hong Kong,China and at the Standard Telecommunication Laboratories in Britain.
VOA : special.2009.12.08
So that, to think nothing is something you have to work at; it's something that you can be preoccupied with.
所以脑子里一片空白,也是需要你努力的事;,需要全神贯注的事。
1945年后的美国小说课程节选 : 耶鲁公开课
But at the same time, you receive an offer to work at another company that is also very intriguing.
但与此同时，你也被另外一家公司录用了，这非常吸引人。
SpeakingMax英语口语达人 : I'm sure 课堂
You really have to work at it." Junior Achievement says three hundred eighty-five thousand volunteers support its programs around the world.
VOA : special.2009.11.27
The Language Teaching Program,for example, brings teachers of English as a foreign language to work at American colleges and universities.
VOA : special.2009.02.12
In 1862, a 14-year-old Williams arrived in Tullamore to work at the local distillery.
Today Iran said it plans to resume work at one of its nuclear plants early next week.
Exploration work at a former tin mine in Cornwall may stop because of rising costs concerns, investors say.