In premise of full understanding geologic background, the analysis of hydrochemistry, carbon-oxygen isotope and rare earth element (REE) were made, then the results yielded as follow.
文章在充分了解地质背景的前提下，对冰凌山钙华的水化学、碳氧同位素和稀土元素作了研究分析，从而取得以下成果。
The premise of tunnel construction safety depends on the grasp of the information about the macroscopic geologic structure and the microscopic geologic structure of the area where the tunnel is.
隧道施工安全的前提是对隧道所在区域宏观地质构造和掌子面前方微观(相对而言)地质信息的掌握程度。
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