Many believed the sun revolved around the Earth, with ancient Greek scholar Ptolemy formalizing this "geocentric" model in 150.
许多人相信太阳绕地球旋转，即古希腊学者Ptolemy于公元150年建立的地心说。
In the paper the author first sketchily introduced the rank level principle, as well as the senior scholar analyzed the sociological model utilizing this principle.
论文中笔者首先粗略介绍了等级层次原理，以及前辈学者运用此原理分析的社会学模型。
Scheduling model of Feedback that had been released by foreign scholar is fit for large control system, for example, airplane.
针对一些学者提出的反馈调度模型主要应用于大型控制系统，如飞机。
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