那里没有汽油加油泵，也很少有汽车修理厂，所以为了应对频繁出现的机器故障，每个司机都必须自己担任修理工的角色。
There were no petrol pumps and few garages, so every driver had to be his own engineer for the frequent breakdowns.
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?
因为active备用机器仍被用于处理用户事务和查询，即使没有故障出现，它也必须是被完全许可的。
Because the active standby machine is still used for user transactions and query, even if no failure occurs, it must be fully licensed.
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