Attack by scavengers and bacteria, chemical decay, and destruction by erosion and other geologic agencies make the odds against preservation very high.
食腐动物和细菌的攻击、化学性腐烂，以及侵蚀和其他地质作用的破坏，导致无法保存的可能性非常大。
There are varied topography and geologic structures and excavated slopes are high and steep at (Xiaowan) Hydropower Station.
小湾水电站开挖区地形、地质构造复杂，边坡高而陡。
The diversion tunnels of the Shuibuya Project feature high head, big discharge, long tunnel line and complicated geologic conditions.
水布垭导流隧洞具有水头高，流量大，洞线长，地质环境差等特点，因而技术问题较多，难度较大。
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