循环使用货币调换服务 revolving cross-currency swap facilities
在控制情况下使用中出现的错误硬盘在保修期之内，当提出合适的证据的进修，厂商会进行调换——有时候还会催促厂商。
Faulty drives used in controlled circumstances are under warranty, and vendors will replace them-sometimes with prodding-when presented with appropriate evidence.
把床垫翻过来并每三个月调换一次方向以延长使用周期。
Flip your mattress and rotate it every three months to extend its life span.
调换电刷：电刷磨损到不能使用时应立即调换，否则会损坏换向器，严重时更容易导致烧坏电机。
Replacement brush: brush wear should not be used to change immediately, otherwise damage the commutator, more easily cause serious electrical burn.
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