这一时期的经济模型最大特点是环境的不确定性，即存在经济风险性。
The obvious advantage of this model is its uncertain environment, that is the economic risky.
云模型是描述不确定性概念的工具。
深入地研究了基于模型诊断中存在的不确定性问题。
The uncertain problem in fault diagnosis is deeply studied in this paper.
深入地研究了基于模型诊断中存在的不确定性问题。
The uncertain problem in fault diagnosis is deeply studied in this paper.
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