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.
然而在同时，我们也能说，一切没有改变，变得只是它们的外形。
Yet it can be said that at the same time nothing is changed and everything is transformed.
此外，这些水族缸的外形也会根据安装地点的不同而改变。
Furthermore, the shape of these tanks and will be different according to the installation site change.
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