提供安全饮用水并做到环境卫生是一项艰巨挑战，但仍然是减少霍乱影响的关键因素。

The provision of safe water and sanitation is a formidable challenge but remains the critical factor in reducing the impact of cholera.

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但是这一分级标准令人困惑：它参考的不同因素太多，其中包括辐射对环境的影响程度和安全系统的损伤程度。

But INES can be confusing: it takes into account many different factors, from the level of radiation released to the effects on the environment and how severely safety systems are stretched.

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上海合作组织要把握影响地区安全的核心问题与关键因素，建立更加完善的安全合作体系。

The Organization needs to grab hold of the core issues and key factors affecting regional security and put in place a full - fledged system for security cooperation.

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