Methods: Theoretical research method and use for practical reference.
方法：理论考证法、实践借鉴法。
The system's functions are easy to use, meeting the needs of practical application. So, it has great reference value for related GIS system construction.
系统功能使用方便、快捷，能够满足实际应用的需求，对相关GIS系统的建设具有参考价值。
This article analyzes and studies the negative psychological effects on youths in sports through a use of documents for reference for physical educators so as to nip in the bud in practical education.
采用文献资料法对体育运动中会对青少年产生的负性心理影响进行了一些分析和研究，为从事体育教育的同行提供参考，以在实际工作中防微杜渐。
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