包容理论就是建立构件最小外包容模型，评定其外形偏差的方法。
The theories of enveloping are to build up the minimum external enveloping model of the mechanical parts, assessing the deviation of its shape.
冷轧钢板和钢带的尺寸，外形，重量及允许偏差。
Dimension, shape, weight and tolerance for code - rolled steel plates and sheets.
车轮踏面磨耗导致车轮外形改变，使其滚动圆直径产生偏差，对车辆系统的动力学特性影响较大。
Wheel tread wear leads to change of the wheel profile and rolling diameter, which influences the dynamic behaviors of railway vehicles seriously.
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