水坝的带来移民安置问题，破坏生态系统，淹没考古地点及文化古迹，增加滑坡的危险，加剧下游的污染程度。
They've necessitated the relocation of millions of people, destroyed ecosystems, flooded archeological and cultural sites, increased the risk of landslides, and raised pollution levels downstream.
他一定是发现了什么非常危险的东西，才会去破坏一个如此重要的古迹。
He must have discovered something very dangerous to destroy such an important archaeological site.
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