duty ָ�����ºͷ��ɵı���һ������ԶҪ��������ǿ���Ծ��ԡ� obligation ָ�����ϻ����϶����˵�����ǿ��ǿ���ԡ�Ҳָ��������ŵ���������е�ij������ responsibility ָ�κ�����ְ�����λ�ְ���������ı��֣�ǿ�������˵����Ρ� function ָ��ְ���ְҵ��ϵȥ����ij��ְ��
�����
1. Is he off or on duty today? ����ʣ������첻ֵ���ֵ�ࣿ
2. Anything subject to duty? ��Ҫ����˰����
3. Keeping the classroom clean is our duty. ���ֽ�����������ǵ����Ρ�
ӢӢ����
n.
1. work that you are obliged to perform for moral or legal reasons
2. the social force that binds you to the courses of action demanded by that force
3. a government tax on imports or exports
��������
duty ����;
��˰;
���أ����÷�Χ������;
ְ��;
off duty �°�;
���˰�(��)������ֵ��(��);
����ֵ�ڵ�;
��Ͼʱ��;