负载均衡是由多台服务器以对称方式组成一个服务器集群，每台服务器都具有同等地位，均能单独对外提供服务。

Load balance is implemented by a server cluster which consists of multiple servers in a symmetrical form. Each server has the same status and is able to provide service independently.

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论文对存在采购商决策偏好时的外包服务竞争均衡进行研究，分析采购商决策偏好对外包服务竞争均衡的影响。

The dissertation also studies the outsourcing service competition equilibrium when the buyer prefers some supplier, and analyzes the impact of buyer's preference on the competition equilibrium.

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