云开大山位于南亚热带南缘，种植亚热带作物热量有余，种热带作物常常不能安全越冬。
Yunkai Great Mountain is located in the Southern fringe of south subtropical zone. There is enough heat for planting subtropical crops but not for tropical crops.
海南岛和台湾的面积差不多，那里有许多资源，有富铁矿，有石油天然气，还有橡胶和别的热带亚热带作物。
Hainan Island, which is almost as big as Taiwan, has abundant natural resources, such as rich iron ore, oil and natural gas, as well as rubber and other tropical and subtropical crops.
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