Most of these are now in place, though they require maintenance.
现在，这些系统绝大多数都已安装好了——尽管它们还是需要维护。
Other design patterns also have a place in process definition, namely maintenance and support.
其它设计模式也在过程定义里也有一席之地，也就是维护和支持。
Is there a formal documented preventive maintenance program in place?
工人是否有记录在案的正式的维修记录？
Maintenance takes place in the maintainability test, and a maintenance is one test sample.
维修性试验中要进行维修作业，每次维修算一个样本。
But the mechanism by which this maintenance takes place is not well understood.
但端粒维持活跃状态的机制一直还不清楚。
But the mechanism by which this maintenance takes place is not well understood.
但端粒维持活跃状态的机制一直还不清楚。
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