容许的零件最大尺寸和最小尺寸即为该零件尺寸的上下限值，零件的实际尺寸必须在上下限值之间。
The maximum and minimum sizes in part dimensions that are acceptable are limits between which the actual part dimension must fall.
控制参数的引入可以使电压无功控制装置根据系统运行状态不断修正电压和无功的上下限值，从而使控制策略具有一定的自适应性。
The control parameter can help to modify the voltage and reactive power's upper limit and lower limit, which make the control tactics adaptive.
利用拟合的分布控制行程时间的中心线、上下限，从而对行程时间的可接受极限值进行界定，对道路网行程质量进行控制。
The range of acceptable traveltime can be obtained through the center, upper and lower bounds controlled by fitting distribution in quality control.
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