Wheel wear is a concern on most metro systems.

对大部分地铁系统来说车轮磨损事关重大。

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Wheel chairs wear out and are expensive and require maintenance.

轮椅磨损和本身的价格以及维护费用。

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While this contaminant layer is responsible for varying friction values, it plays a beneficial role by separating the wheel and rail surfaces, usually decreasing wear.

轮轨表面的污染层也会影响粘着系数的变化，它避免了轮轨表面直接接触，有利于减少磨损。

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It is thought some cars could be affected by premature wear of wheel bearings due to water entering the system.

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You could wear a top hat at the wheel.

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It's just hard to score in the luxury market when you refuse to do an eight-cylinder engine, wear undistinguished styling and don't offer a rear-wheel-drive car.

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