There are many methods to calculate the yield of water in the assessment of water resources, but the any single approach is hard to assure the precision.

给水度的计算很多，在水资源评价中，选择单一的方法难以保证精度。

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The vulnerability assessment of water resources is comprehensive analysis of water resources ecosystem, including the supply and demand of water resources.

气候变化下水资源脆弱性评估是水资源系统的综合评估，主要包括水资源供给与需求平衡的评估。

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Environmental impact assessment of water resources project is a multi-index hierarchy complex, of which the key problem is how to quantify with reason the weights of each index of the system.

水资源工程环境影响评价是由众多指标组成层次结构的复杂系统，其关键问题是如何合理确定各评价指标的权重。

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