求翻译：C. 地下障碍物探测：承包人应在现场进行详细踏勘，查明地下管线和障碍物的位置和标高，制定保护或修复措施。在有地下管线和障碍物的地带施工时，承包人必须提前三天通知监理工程师或有关主管部门人员，并且这些设施的保护、支撑和维护方案应获得监理工程师或主管部门人员同意。如果在施工中不慎对这些地下管线和障碍物造成损坏，承包人必须及时予以修复，费用由承包人自理。如果承包人要切断施工中所遇到的地下管线和障碍物，必须事先向有关当局提出申请，并在经监理工程师书面批准后方可实施。是什么意思？

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. * underground obstructions C Detection: contractors should be at the field in more detail, to identify underground pipeline exploration and the location of the obstacle and elevation, and for the protection or restoration. In an underground pipeline and obstructions of the Strip construction, the

C. underground obstacle detection: the contractor shall conduct a detailed survey in the field, identify the location and elevation of underground pipes and obstructions, protection or rehabilitation measures. When the zone construction of underground pipes and obstructions, the contractor must thre