王荣安的回答：B in duty有义务，有责任 as in duty bound 有责任, 义不容辞 be in duty bound 有义务(做某事) be in duty bound to do sth. 有义务(做某事) on duty值班，当值 off duty下班 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。 duty free免税 李心彤的回答：B in duty有义务，有责任 as in duty bound 有责任, 义不容辞 be in duty bound 有义务(做某事) be in duty bound to do sth. 有义务(做某事) on duty值班，当值 off duty下班 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。 duty free免税 我就是我☆的回答：我下班了 |
