work at,work in ,work for ,work out有什么区别

work at: to exert effort in order to do, make, or perform something; 例如:
"the child worked at the multiplication table until she had it down cold"
work on: to exercise influence on; persuade; affect: 例如: I'll work on her, and maybe she'll change her mind.
work in:
a. to bring or put in; add, merge, or blend:
例如: The tailor worked in the patch skillfully. Work the cream into the hands until it is completely absorbed.
b. to arrange a time or employment for:
例如: The dentist was very busy, but said she would be able to work me in late in the afternoon. They worked him into the new operation.
work out,
a. to bring about by work, effort, or action.
b. to solve, as a problem.
c. to arrive at by or as by calculation.
d. to pay (a debt) by working instead of paying money.
e. to exhaust, as a mine.
f. to issue in a result.
g. to evolve; elaborate.
h. to amount to (a total or specified figure); add up (to): The total works out to 176.
i. to prove effective or successful: 例如: Their marriage just didn't work out.
j. to practice, exercise, or train, esp. in order to become proficient in an athletic sport: 例如:The boxers are working out at the gym tonight.

work in 引进,配合
work at 从事,致力于……
work for 为……做事,为……尽力,被……雇佣者
work out 可以解决,设计出,算出,计算出,消耗完
挤出去