edge illusory

例句：

1. 1. The book is on the edge of the table.
   这本书放在桌子的边缘。
2. 2. The car's bumper is designed to protect the vehicle from the edge of the road.
   汽车的保险杠设计用来保护车辆免受道路边缘的伤害。
3. 3. The mountain range forms a natural boundary between the two countries.
   山脉形成了两国之间的自然分界线。