duty和obligation的区别？

看 他们产生的原因不同

duty

n.（名词）
【复数】 du.ties
An act or a course of action that is required of one by position, social custom, law, or religion:
责任：因地位、社会习惯、法律或宗教的需要而产生的行为或行为的过程：
Do your duty to your country.
为你的国家尽义务
Moral obligation:
道德上义务：
acting out of duty.
出于道德责任而为
The compulsion felt to meet such obligation.See Synonyms at obligation
责任感：一种想负起这种义务的感情参见 obligation
A service, function, or task assigned to one, especially in the armed forces:
兵役：军队里的服务、职责和分派的任务：
hazardous duty.
危险的任务
Function or work; service:
职责或工作；服务：
jury duty.See Synonyms at function
陪审员的职责参见 function
Abbr. dy.A tax charged by a government, especially on imports.
缩写 dy.税：一种由政府对进口货物征收的税，尤指进口关税
Abbr. dy.
缩写 dy.
The work performed by a machine under specified conditions.
功能负荷：由机器在特定条件下完成的工作量
A measure of efficiency expressed as the amount of work done per unit of ener