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。

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To prevent flooding, we shall have to divert the river from its course.

为防止水涝，我们必须使河水改道。

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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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This is no way to prevent flooding and protect our woodlands, rivers and special wild places.

BBC: Green campaigners dismayed by Budget

To prevent flooding, a system of pumps, canals and levees was put in place by the Army Corps of Engineers.

CNN: Storm surge the fatal blow for New Orleans

Lots of good work and preparation have gone into efforts out there to prevent flooding and damage with state and local officials.

WHITEHOUSE: Press Briefing