border mutual trade management

例句：

1. 1. The border between China and India is a long and complex one.
   中国和印度之间的边界非常长且复杂。
2. 2. The city's border with the countryside is marked by lush forests and rolling hills.
   这个城市与乡村的边界被郁郁葱葱的森林和起伏的山丘所标出。
3. 3. The border town has become a bustling hub for trade and commerce.
   这个边境小镇已经成为一个繁忙的商业和贸易中心。