调查人员已经勘察过每一条已知小道，亚历山大。
本文提出在下一步详细可行性研究阶段对对工程勘察、工程河段水文等专题进行更加详细的调查和论证。
The paper proposed to make more specific investment and discussion on subjects like project investigation and river section hydrology in next phase of specific feasibility research.
勘察了现场的砖家怀疑石灰岩被腐蚀，导致地下的喀斯特溶洞突然坍塌，从而形成了天坑，但调查还在进行中。
Experts on site suspected that the sudden collapse of an underground karst cave created by eroded limestone caused the sinkhole, but the investigation is ongoing.
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