Location analysis on economic activity is one of the most ancient and most important topics in regional economics and economic geography.

经济活动的区位分析是区域经济学和经济地理学领域最古老和最重要的研究内容之一。

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Reasons for choice of a sow housing or penning system include the preferences of the pork producer, economics, legal requirements, geographic location and welfare of the sows.

究竟是要选用哪种饲养方式是要考虑到以下几个因素的：猪肉生产商的目的或偏爱、经济条件、法律规定。

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Urban tourism place planning and design is mainly affected or restricted by some factors as tourism resources, regional location, tourism markets, social economics, and tourism traffic, etc.

城市旅游空间规划布局主要受资源、区位、市场、社会经济及旅游交通等多种因素的影响和制约。

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Depending on the economics of the location, the process can produce gas that can be burned for heat and power, or purified and sold as natural gas, or, perhaps in the future, used as a feedstock for chemicals or plastics.

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