Today, rivers are controlled for many reasons, primarily to maintain reliable water supplies for daily, agricultural and industrial needs, for power generation, for navigation, and to prevent flooding.
今天，河流控制的原因有很多，主要是为了维持可靠的水资源供应，以满足日常生活、农业和工业、发电、航行的用水需要，并起到防洪作用。
It is cheaper to protect vegetation and use that vegetation to regulate water flow than it is to build a dam to prevent flooding.
相对于修坝来防洪水，保护水源地的植被，通过植被来调节水资源的时空分布成本更低。
It is cheaper to protect vegetation and use that vegetation to regulate water flow than it is to build a dam to prevent flooding.
相对于修坝来防洪水，保护水源地的植被，通过植被来调节水资源的时空分布成本更低。
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