外部不确定性 (External Uncertainty)：进入 者所处外部环境的不可预见性。 内部不确定性 (Internal Uncertainty)：进入者 无法通过观察结果来判断合作者的绩效。
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由于系统本身和外部条件的不确定性，很难对系统各状态进行准确的数学描述，造成滤波器不稳定甚至发散。
Due to uncertainty in both system itself and the circumstance condition, it's difficult to take an accurate mathematics description of every state of the system.
不确定性会计是财务会计体系的一部分，其目标是向外部使用者提供不确定性经济业务信息。
Uncertainty accounting is a part of financial accounting as a whole, of which objective is to provide external users with information about un.
针对具有参数不确定性和外部未知扰动的不确定系统，基于灵敏度函数，提出了一种二自由度控制结构。
For uncertain systems with parameter uncertainty and unknown disturbance, a two-degree-of-freedom control structure was proposed based on sensitivity function.
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