水电是可再生能源中目前唯一能形成供给规模、改善结构、保障安全、恢复大气及生态环境的优质能源。
The hydropower is a good renewable energy source, having the advantages of the supply greatly, the improving structure easily, ensuring safety, bettering atmospheric and the ecological environment.
因此，寻找替代能源、开展可再生能源的研究，对于维护国家的能源战略安全、减少环境污染具有十分重要的意义。
So, it is very significative to find some new substituted energy, develope the study of renewable energy for protecting the security of energy strategy and reducing the environmental pollution.
城市水环境安全和水资源保护已经成为备受关注的热点问题，而城市污水和再生水的消毒是其中的关键环节。
Water environmental safety and water resources protection have become the hot issues in recent years, and disinfection of urban wastewater and reclaimed water is the most important part.
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