First, the concept and calculation method of customer service level based on customer segmentation are advanced through computing the customer lifetime value.

第一，通过客户生命周期价值的计算，进行客户价值细分，提出了基于客户细分的分销系统客户服务水平的概念和计算公式。

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At first, the thesis defines the concept and extension of the higher-level talent, and briefs its construction.

本文首先对高层次人才的概念和外延进行了界定，对其构成进行了阐述。

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But still, in this first stage, into the eighteenth century, literature was primarily a generalized social concept, expressing a certain (minority) level of education achievement.

但是，在第一个阶段，直到十八世纪，文学基本上仍是一种普遍化的社会概念，它表明一定水平(少数人)的教育成就。

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