work on somebody:to try to influence somebody “试图影响，努力说服” e.g. We'll have to work on Mary to find out what's going on. 我们必须努力从玛丽那里弄清楚发生了什么事。 work at something: to try hard to develop or improve something “在…上下功夫，致力于” e.g. You'll have to work at the weak points in your English if you want to pass the examination. 如果你要通过这个考试就必须多在你的英语弱项上下功夫。 work on somebody: to try to influence somebody “试图影响，努力说服” e.g. We’ll have to work on Mary to find out what’s going on. 我们必须努力从玛丽那里弄清楚发生了什么事。 work at something: to try hard to develop or improve something “在······上下功夫，致力于” e.g. You’ll have to work at the weak points in your English if you want to pass the examination. 如果你要通过这个考试就必须多在你的英语弱项上下功夫