duty/ 'djuːtɪ /

1.noun [c/u] 
(responsibility) 责任

2.noun
(tax) 税

3.n pl
duties (tasks) 任务

it is my duty to...
…是我的职责
to pay duty on sth
支付某物的税
to report for duty
述职
to be on/off duty
 [+policeman,nurse] 上/下班
duty chemist/officer/doctor
值班药剂师/官员/医生