二手车市是品质不确定性的一个典型例子。
The used car market is the classic example of quality uncertainty.
理论分析证明，该方案有效地改善了系统的动态品质，并且对系统的不确定性因素具有较强的鲁棒性。
It is demonstrated by theoretical analysis, that the scheme efficiently improves the dynamic characteristics and is robust to the system uncertainties.
由于这些不确定性的存在，按照理想模型得到的最优控制在实际上不仅不能保证最优，而且会引起控制品质的严重下降。
Because these uncertainties existence, in fact, optimum control which obtained according to the ideal model not only can't guarantee optimum, but also cause the control quality to descend seriously.
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