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。

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L 'oreal Paris optimal compatibility selected components in the selection of natural ingredients from nature and mineral pigments.

精选成分优化兼容性巴黎欧莱雅从大自然中精选天然成分和矿物质颜料。

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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。

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It adds that the lightweight nature of the system means that apps should run smoothly and offer "optimal battery life" on low-end devices.

BBC: First Firefox phones revealed by Mozilla and Geeksphone