arc-trench gap

例句：

1. 1.The engineers carefully measured the arc-trench gap to ensure it was within acceptable limits.
   工程师们仔细测量了隧道缺口，以确保它处于可接受的范围内。
2. 2. Due to the arc-trench gap, the tunnel is not suitable for heavy vehicles.
   由于隧道缺口的存在，该隧道不适合重型车辆通行。
3. 3.The construction crew had to make adjustments to compensate for the arc-trench gap.
   施工队伍不得不进行调整以弥补隧道缺口。