1. After retiring from service, they will suffer from bone tissue hurt and osteoporosis in a degree. ������֮����һ��Ⱥ�����ֲ�ͬ�̶ȵĹ���֯��ʹ���������֢��
2. Another factor that could affect the future of US space flight is a possible delay in retiring the space shuttle. �������ܵ�������δ��̫�շ��мƻ����ڵ����ؾ������еĺ���ɻ����ܻ��������ۡ�
3. Long-time columnist Robert Novak says he's retiring immediately, a week after being diagnosed with the brain tumor. ����ϻ�������һ�ܺ��ڵ���ר�����ҵ�����ŵ�߿����������������ݡ�
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adj.
1. moving toward a position farther from the front
2. not arrogant or presuming
3. of a person who has held and relinquished a position or office
4. reluctant to draw attention to yourself