area tie line

例句：

1. 1. The area tie line is used to demarcate the boundaries of different regions.
   区域界限线用于划定不同区域的边界。
2. 2. The construction of this new highway will have a significant impact on the area tie line.
   这条新高速公路的建设将对区域界限线产生重大影响。
3. 3. The study of geography often involves mapping and identifying the area tie lines.
   地理学研究通常包括地图绘制和识别区域界限线。