mission,responsibility,duty都有责任之意,它们之间有何区别?

mission,responsibility,duty都含“职责”、“责任”的意思,但
mission
侧重于非常重要的任务,如军事中的任务；意为使命; 天职;【军】任务.
使命；任务
He was sent to Washington on a diplomatic mission.
他被派往华盛顿,负有外交使命.
She believed that her mission in life was helping the old and the sick.
她认为她一生的天职就是帮助老人和病人.
This mission must be accomplished.
这一使命必须完成.
responsibility
指“由于法律、职业或道德等的要求而应尽的责任”,含有“法津上对后果负责任”的意味,如:
The resposibility rests on us.
这由我们负责.
A father has many responsibilities.
父亲要尽许多责任.
LEGAL RESPONSIBILITY
法律责任
theory of social responsibility
社会责任论
managerial responsibility system of contracting
承包经营责任制
duty
责任; 义务; 本分
指“道义上的责任”,较强调“自觉性”,如:
Every citizen has the duty to construct his country.
每个公民都有建设祖国的责任.
Do not forget your duty to your parents.
不要忘记对父母应尽的责任.
Only one doctor is on duty today - the other doctor is off duty.
今天只有一个医生值班,另一位下班了.
此外,obligation
指“按照法律、合同、诺言等的要求,应尽的义务”,如:
You're under obligation to care her.
你有义务照顾她.