duty /ˈdju: ti/ n. 1.［u］责任，义务: It is my duty to protect my sister. 保护我妹妹是我的责任。 To obey the laws is everyone’s duty.遵守法律是每个人的义务。 2.［c］职责，职务，任务: One of her duties is to report any absentees.她的职责之一是报告任何缺席者。 The duties before me are certain to be heavy.我面临的任务肯定是艰巨的。do one’s duty尽自己的责任：We are anxious to do our duty. 我们急于尽责。off duty 不上班，下班： The policeman is off duty now. 警察现在下班了。on duty 值班；上班： He goes on duty at 8 a.m. and comes off duty at 5 p.m. 他上午8时上班，下午5点下班。Who’s on duty today?今天谁值日? 3. ［c］&［u］税，关税: customs duties关税 duty on 上税: Is there any duty on these things? 这些东西上税吗?