The UNITRACE also can be used to check continuity, especially in repair situations, where continuity had previously been established.

UNITRACE也可用于检查电路的连续性，特别是在修复情况时。

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These can be used to overcome exceptional situations and thus to repair the process instance.

可以使用这些新功能克服异常情况，从而修复该流程实例。

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Or it may simply be a by-product of the fact that these two proteins have different functions in other situations, such as wound healing or repair of sunlight-induced skin damage.

或者它可能是一个简单的副产品，事实上这两种蛋白质在其他情况下具有不同的功能，如伤口愈合或阳光引起损伤的皮肤修复。

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Therefore, full safe clearance is never done during the day (except in emergency repair situations), and nighttime is the only time all the major maintenance work can be completed.

FORBES: Why Does BART Need To Do Nightly Maintenance?