clearance gauge for pantographs

例句：

1. 1.The engineer used a clearance gauge to measurethe clearance between the two tracks.
   工程师使用清障仪测量两条轨道之间的间隙。
2. 2.The clearance gauge was used to ensure thatthe vehicle would not hit the obstacle inthe road.
   清障仪被用来确保车辆不会在道路上撞到障碍物。
3. 3. Theclearance gauge was crucial for maintaining safe drivingconditions on the highway.
   清障仪对于高速公路上保持安全驾驶条件至关重要。