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.
本文以半湿润地区大汶河流域为例，研究提出水污染控制方案和水生态环境恢复的措施。
This research, regards Dawen river in semi-humid region as example, has put forward water pollution control projects and aquatic ecological environment restoration measurements.
应用推荐