duty to do sth
表示‘做某事的责任’，常用it作形式主语。
It is your duty to report any suspicious activity.
你有责任报告任何可疑活动。
道德或法律上应尽的责任；在工作岗位上负责或执行某项任务的状态；职责；消费税；尤指进出口关税
a responsibility or obligation that makes you do what is morally or legally right
道德或法律上应尽的责任
That which one is morally or legally obligated to do.
义务
the social force that binds you to the courses of action demanded by that force; ; - John D.Rockefeller Jr
在工作岗位上负责或执行某项任务的状态
The state of being at work and responsible for or doing a particular task.
职责
work that you are obliged to perform for moral or legal reasons
消费税；尤指进出口关税
An excise tax; especially, one on imports or exports.
关税
a government tax on imports or exports
发动机每单位燃料所做功的效率；尤指蒸汽泵机燃烧一蒲式耳或一英担煤将水提升一英尺的磅数
The efficiency of an engine in work done per unit of fuel; particularly, the number of pounds of water which a steam pumping engine can raise one foot by burning one bushel or hundredweight of coal.
It is my duty to help my younger sister with her homework.
帮助妹妹做作业是我的责任。
用法提示：duty 作名词，意为“责任、义务”，在句中作表语。
AI contextual example
The nurse performed her duties with great care.
那位护士非常认真地履行了自己的职责。
用法提示：duties 是 duty 的复数形式，表示“职责”，作动词 performed 的宾语。
AI contextual example
As a citizen, you have a duty to obey the law.
作为公民，你有遵守法律的义务。
用法提示：duty 作名词，意为“义务”，在 have a duty to do 结构中表示“有义务做某事”。
AI contextual example
表示‘做某事的责任’，常用it作形式主语。
It is your duty to report any suspicious activity.
你有责任报告任何可疑活动。
表示‘做某事的职责’，后接动名词。
The duty of caring for the environment falls on everyone.
保护环境的责任落在每个人身上。
固定短语，表示‘值班、上班’。
The nurse is on duty tonight.
那位护士今晚值班。
指关税，后接需纳税的商品。
You must pay duty on imported electronics.
你必须为进口电子产品缴纳关税。
与 duty 最接近，但 duty 更强调道德或法律义务。
obligation 侧重法律或合同约束，duty 侧重内在责任。
commitment 强调自愿承担，duty 可能非自愿。
burden 强调繁重或不愉快，duty 中性。
grammar · medium
易错句子He is in duty today.
正确表达He is on duty today.
中文常直接用「在」对应英文，但固定短语是"on duty"（值班），"on"表示状态。
grammar · medium
易错句子She has many duty to do.
正确表达She has many duties to do.
"duty"作可数名词表示具体职责时，复数形式为"duties"；中文无复数变化，容易忽略。
指道德或法律义务的反面，即应得的权益
与强制责任相对的特别优待
与责任约束相对的自由状态
针对关税义务的免除
与必须履行的责任相对的选择自由
责任强调对某事的负责，而duty更强调道德或法律义务
义务强调法律或契约约束，而duty更广泛
值班
The security guard is on duty until midnight.
保安值班到午夜。
下班
What do you usually do when you're off duty?
你下班后通常做什么？
责任感
He was motivated by a strong sense of duty.
他受强烈的责任感驱使。
尽责任
We must do our duty to protect the environment.
我们必须尽责任保护环境。
进口关税
The government increased import duties on luxury goods.
政府提高了奢侈品的进口关税。
免税
You can buy duty-free items at the airport.
你可以在机场购买免税商品。
职责所在；责任在召唤
I'd love to stay, but duty calls.
我很想留下，但职责所在。
在执行公务时；履行职责时
The firefighter was injured in the line of duty.
这名消防员在执行公务时受伤了。
责无旁贷；有责任
As a doctor, I feel duty bound to help.
作为一名医生，我感到责无旁贷要提供帮助。
责任，荣誉，国家
As a soldier, he lives by the motto 'Duty, Honor, Country'.
作为一名士兵，他遵循‘责任，荣誉，国家’的格言。
保护这座城市是我的职责。
In the movie 'The Dark Knight', Batman declares, 'It is my duty to protect this city.'
在电影《黑暗骑士》中，蝙蝠侠宣称：‘保护这座城市是我的职责。’
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.