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��ְ��
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1. As a citizen, we have the obligation to protect our environment. ��Ϊһ�������������������ǵĻ�����
2. I am under obligation both to Greeks and to barbarians, both to the wise and to the foolish. ������ϣ���˻���δ�������ˣ��������˻����ޱ����ˣ��Ҷ�Ƿ���ǵ�ծ��
3. To fulfill this urgent obligation, the perspective needed is not only national, but also global. Ϊ�����й�������������Ҫ������ȫ����Χ�ģ�������ȫ��ġ�
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n.
1. the social force that binds you to the courses of action demanded by that force
2. the state of being obligated to do or pay something
3. a personal relation in which one is indebted for a service or favor
4. a legal agreement specifying a payment or action and the penalty for failure to comply