Uncertainty factors of a project construct process which includes randomicity and fuzziness affect the evaluation of project completion time greatly.
项目建设过程中的不确定性因素对预测项目完工时间有较大影响，项目中的不确定性主要是随机性和模糊性。
After completion of the Three Gorges Project, a long time erosion will occur in the middle and lower reaches of Yangtze river, and the characteristics of river channel will be changed obviously.
三峡水库建成后，长江中下游河道将遭受长河段、长时期冲刷，河床河性会发生很大变化。
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