setting-out rod

例句：

1. 1. The setting-out rod is essential for the construction of the bridge.
   出发杆对于桥梁的建设至关重要。
2. 2.The engineer used a setting-out rod to mark the location of the new road.
   工程师使用一根出发杆来标记新道路的位置。
3. 3.The setting-out rod was used to ensure that the workers were in the right place at the right time.
   出发杆被用来确保工人在正确的时间和地点。