由于均方根偏差只涉及光场密度矩阵的二阶统计矩，在许多情况下，这种物理量不能精确量度光场的量子涨落。
However, RMS deviation only contains the second-order statistical moments of the density operator. Thus under many circumstances, RMS deviation cannot precisely measure the quantum fluctuation.
工程施工中安全、质量、费用及工期的综合优化，在许多情况下需要涉及权重的确定，但权重值常很难精确确定，具有不确定性。
Weighted value of safety quality cost time in most cases must be regarded for trade-off optimization, but it is difficult to be determined for its uncertainties.
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