1. It is obviously a process involving cumulative danger. ��Ȼ����һ���ۻ�Σ�յĹ��̡�
2. Shortest path is based on cumulative link costs. Link costs are based on the speed of the link. ��̵�·���������ۼƵ�����ɱ��������ġ�����ɱ������������ٶ��������ġ�
3. If you don't pay its cumulative upkeep and have to sacrifice it, it gets an age counter first, which impacts the amount of life you gain. ���㲻֧�����ۻ�ά�ַ��ö���������֮�������Ի��ȵõ�һ������ָʾ����һ�Ӱ��������õ�����������