duty

/ˈduti/

the social force that binds you to the courses of action demanded by that force; ; - John D.Rockefeller Jr

中文释义：责任；义务；职责

It is the duty of every citizen to obey the laws of the country.

遵守国家法律是每个公民的义务。

The security guard was on duty all night to ensure the building's safety.

保安整夜值班以确保大楼安全。