1) Where mechanical digging equipment is used,an undocumented or misaligned utility line can be easily be damaged if it is not observed by the excavation workers. Gas and electricity lines present very obvious safety threats in this situation.
原句
2) There are several geophysical techniques with proven capabilities in non-intrusive subsurface investigation....
原句
3) One way to verify the location of such buried objects is to cautiously dig a trial pit to expose the object in question.
同样，我们发现原句是
补充资料：同样
1.相同，一样。
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