历史时期和地理位置的分界线相互交织：从中世纪过渡到文艺复兴时期；
The dividing lines between historic periods and geographic places are permeable: the Middle Ages flows into the Renaissance;
许多地理学家认为，乌拉尔山脉是欧亚两洲的分界线。
Many geographers say that the Ural Mountains form the dividing line between Europe and Asia.
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.
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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