不管保修单上怎么说，当产品出现故障时，你仍然可以去商店维护自身的权益。

Whatever a guarantee says, when something goes wrong, you can still claim your rights from the shop.

《柯林斯英汉双解大词典》

出现故障时，您需要一个系统来通知您。

When a failure does occur, you need a system to notify you.

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当没有出现故障时，如何使用备用机器？

How is the standby machine being used when a failure has not occurred?

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