作为中国的气候分界线，这里的气候变化莫测。
As Qinling-Huaihe line is the dividing line of China's climate.
历代长城的布设都是以自然地理环境为基础，其走向与我国半湿润与干旱气候分界线基本一致。
The arrangements of the wall in past dynasties are based on physiographic conditions, and are Just Consistent with the demarcation line between semi-humid and arid climates in the country.
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