Most changes were in the form of tweaks, instead of major overhauls.
大多数变化的形式屏幕，而不是大的检修。
Major overhauls or installations may be scheduled during plant shutdowns or over weekends, which requires scheduling of maintenance manpower to work during those periods.
大修或装置可能被安排在工厂停工或在周末，这需要维护的人力调度，在这些时期内的工作。
Mobile applications often require major design overhauls.
移动应用经常需要进行重大的调整。
Mobile applications often require major design overhauls.
移动应用经常需要进行重大的调整。
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