Aimed at the wear problem of roll axle neck, failure analysis and rebuilding were made for multi-roller mill.

针对多辊筒碾压机压辊轴颈磨损严重的问题，对其进行了故障分析和改造。

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In this paper, the wear problem of 12150 engines is discussed in detail. The wear types and wear reason are summarized.

本文对12150发动机的磨损情况进行了详细的分析与讨论，总结了该发动机的磨损类型与磨损原因。

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The paper establishes the general differential equations about elastic liner wear problem of mult-rope friction hoist considering the differences of rope's length and rope grooves.

本文建立了同时考虑钢丝绳长度差及绳轮半差时的弹性衬垫磨损的微分方程式；并由此得到了衬垫绳槽稳定磨损的条件；

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The Saracens lock aggravated a long-standing "wear and tear" problem in his left knee during England's 15-15 draw with Scotland last Saturday.

BBC: Moody to captain England as Deacon replaces Borthwick

Most experts advise patients after bunion surgery to be careful what shoes they wear to avoid a recurrence of the problem.

WSJ: Young People Also Weigh Surgery to Relieve Ugly, Painful Bunions

The problem is that these switches wear out, they get crushed by flying "air balls", or they are knocked and bent out of position.

BBC: Flipping heck: Is pinball about to stage a recovery?