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。
A similar system has also been developed for checking wheel wear.
相似的系统也用于检查车轮的磨损情况。
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。
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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