chain-and-ducking dog mechanism

例句：

1. 1.This chain-and-ducking dog mechanism is designed to prevent the dog from jumping over the fence.
   这个链条和鸭子机制被设计来防止狗跳过围栏。
2. 2.The chain-and-ducking dog mechanism was installed to improve the safety of the construction site.
   链条和鸭子机制被安装来提高建筑工地的安全性。
3. 3.The chain-and-ducking dog mechanism has proven to be an effective way to control the movement of large animals in the field.
   链条和鸭子机制已被证明是一种有效的方法，用于控制田野中大型动物的运动。