要在有限的保障经费下实现高可用度要求，就必须建立装甲装备的使用可用度与维修保障费用的优化模型。
Optimization models of armored equipment operational availability and maintenance support cost must be established in order to achieve availability objective under limited support cost.
(瑞恩先生欲一次解决问题的数量有限：他的预算方案未触及另外一个最大的项目——社会保障制度，国家养老金方案)。
(There are limits to the number of live rails Mr Ryan is willing to grasp at once: his budget leaves intact the biggest single item in the budget, Social Security, the state pension scheme).
如果覆盖的范围有限，那么就是希望，比起完全没有医疗保障，人们还是情愿选择便宜的医保。
The hope is that people will prefer cheap, if limited, health care to none at all.
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