在基本蚁群算法的基础上，用确定性选择与随机性选择相结合的方法对节点的状态转移规则进行改进。
Grid method was applied to establish an environment model. The conversion rule of node state was improved by combining decided selection with random selection.
在存在不确定性的情况下或者有多个选择时尤其如此。
This is especially true in situations of uncertainty or when several choices are available.
由于抽样变异性和模型选择所引起的不确定性应在展示疾病负担结果的时候予以说明。
The uncertainty owing to both the sampling variability and the choice of model (s) should be given when disease burden results are presented.
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