Problems of water source, flood disaster, and water pollution are the three hydrological responses in urbanization process, also are the main issues in water environment management.

水源问题、洪水问题、污水问题是城市化过程中的三大水文响应，也是城市水环境管理研究的重要课题。

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America is both by far the biggest donor to flood relief and the biggest source of other bilateral aid.

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Dams offer a renewable energy source, providing the means for irrigation, transportation and flood protection.

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Though destructive, the flood of neutrons produced by a tokamak is (or, rather, should be) the source of its power.

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