four-way box

例句：

1. 1. The four-way box is used to control the flow of traffic at busy intersections.
   四向盒用于控制繁忙交叉口的交通流动。
2. 2.The engineer tested the four-way box before installing it in the factory.
   工程师在工厂安装之前测试了四向盒。
3. 3.The four-way box was designed to improve safety and reduce congestion on the road.
   四向盒的设计旨在提高安全性并减少道路上的拥堵。