指在一个社会单元中，人们对占据特定位置的个体所期望的一套行为模式。
A set of behavior patterns expected of someone occupying a given position in a social unit.
角色；指在一个社会单元中，人们对占据特定位置的个体所期望的一套行为模式。
Role: a set of behavior patterns expected of someone occupying a given position in a social unit.
物流系统是一个由众多物流单元组成的大系统，它的可靠性程度对企业和社会的平稳运行有着重大的影响。
The reliability of logistics system has a great influence on the society and the enterprises. A logistics system is a huge system contained many logistics units.
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