The historical origin of natural village is also discussed.
并就自然村落的历史根源进行了探讨。
The university teacher service has its historical origin, and has its own characteristic.
高校教师服务有其历史的渊源，并有其自身的特点。
The university teacher service has its historical origin, and has its own characteristic.
高校教师服务有其历史的渊源，并有其自身的特点。
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