trailed implement

例句：

1. 1. The engineer designed a new type of implement for the construction site.
   工程师设计了一种新型的施工工具。
2. 2. The teacher used a chalk implement to explain the concept of gravity.
   老师用粉笔作为教具来解释重力的概念。
3. 3. The scientist used an implement to test the hypothesis that light travels faster than sound.
   科学家使用一种装置来测试光速比声速快的假设。