1. It is incumbent up on us to do so . �������������岻�ݴǵ����Ρ�
2. Love themselves, love their own lives have become the responsibility incumbent upon you. �ذ��Լ����䰮�Լ��������ѳ�Ϊ���岻�ݴǵ������ˡ�
3. The future of the world economy depends on how both China and the incumbent powers adapt to their new roles. ���羭�õ�δ��ȡ�����й��Լ����е�ǿȨ������Ӧ���ǵ��½�ɫ��
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n.
1. the official who holds an office
2. lying or leaning on something else
3. necessary (for someone) as a duty or responsibility; morally binding
4. currently holding an office