tread lug

例句：

1. 1. The car's engine is located under the tread lug.
   汽车的发动机位于脚踏板下方。
2. 2. The old man sat on the tread lug and read his book.
   老人坐在脚踏板上看书。
3. 3.The engineer tested the tread lug for safety before starting the project.
   工程师在开始项目之前测试了脚踏板的安全性。