The many complex factors and the dynamic nature of data means that an optimal plan evaluation is often a complex process indeed for any database system.
这么多复杂的因素，再加上数据本身的动态性，使得最佳计划的评估对于任何数据库系统而言通常都是一个复杂的过程。
The task of education is to build up, in a manner appropriate to the nature of children's life an optimal cultural context.
教育的使命就是根据儿童的生命本性为儿童营造优化的文化情境。
Aircraft layout problem with performance constraints can be partitioned into finite subproblems, which overcome the on-off nature about optimal variables.
带性能约束的航天舱布局问题可分解为有限多个子问题，每个子问题克服了关于优化变量的时断时续性。
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