求翻译：　　　　（2）轮缘磨损：正常行驶时，轮缘磨损一般不严重。当车辆通过曲线、岔道时，由于外侧车轮轮缘与外轨内侧产生挤压和摩擦，才造成外侧车轮轮缘的磨损；当车辆产生蛇形运动时，车辆两侧的轮缘都会产生磨损。轮缘磨损会使车辆的动力性能及稳定性降低，有时甚至会发生脱轨等安全事故[3]。轮缘磨损达到一定限度之后，就要通过旋修的方式来使轮对重新达到服役的尺寸标准，轮缘的磨损虽然不作为轮对报废的标准，但对其厚度和高度是有一定要求的，一般要求轮缘的高度在26-30mm之间，厚度不能小于23mm。是什么意思？

( 2 ) rim wear : normal driving, the rim wear is generally not serious.

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(2) wheel rim attrition: When normal speed, the wheel rim wears is not generally serious.When vehicles through curve, crossing, because the flank wheel wheel rim and the outer rail inside produce extrude and rub, only then creates the flank wheel wheel rim the attrition; When the vehicles have the s

(2) wheel flange wear: normal driving, wheel flange wear is generally not serious. When the vehicles through the curves, forks, because the outer wheel flange and the outer rail compression and friction inside, was responsible for the outer wheel flange wear when it produced a snake-like movements,

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