They formed in the environments of humid warm and dry cold climate in turns.
岩溶洞穴沉积物形成于湿暖、干冷交替的环境；
Being at a high altitude, Shanxi Province has a cold and dry climate and has an annual rainfall of between 400-600 millimeters.
处于高海拔地带，山西的气候寒冷干燥，年均降水量在400 - 600毫米之间。
Dry rosin is best in tropic and soft rosin in cold climate.
干的松香在热带最适用，而软的松香适用于寒冷的气候。
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