adjoint variable

例句：

1. 1. The two buildings are connected by a bridge.
   这两栋建筑通过一座桥相连。
2. 2. The adjoining rooms have been converted into a living room and a bedroom.
   相邻的房间已经被改造成客厅和卧室。
3. 3. The adjoining countries share a border and often trade with each other.
   相邻的国家共享边界，并且经常进行贸易。