求翻译：开挖作业前，应确定地下设施（如地下管道、电缆等），针对具体情况采取有效的安全措施。当挖掘作业接近地下设施时，应采用人工挖掘。是什么意思？

Excavation operations shall be determined before the underground facilities (such as underground pipes, cables, etc.), to take effective security measures for specific situations. When mining operations close to underground facilities, should be dug.

pre-operational, digging underground facilities should be identified (such as underground pipes, cables, etc. ) for specific situations, take effective measures of security. When Excavation near underground facilities should be used when dug.

Excavates in front of the work, should determine the underground facility (for example underground duct, electric cable and so on), take the effective security measure in view of the special details.When under excavation work avenue of approach facility, should use the manual excavation.

Before excavation job, determine the underground facilities (such as underground pipes, cables etc), situation-specific and effective security measures. When the mining operations near the facilities, dug to be used.

We keep the city clean is paramount