It is throughout the maintenance phase that the software evolves the most.
软件的演进主要发生在整个维护阶段。
Maintenance phase, we aim at enhancing customer value and extending online time.
客户维系阶段旨在提高客户在网价值、延长客户在网时间；
Hence, performance optimalization in software maintenance phase takes important part in all software lifecycle.
因此，软件维护阶段性能优化在整个软件生命周期中占有重要位置。
Yet the most important (and time-consuming) phase is maintenance.
但最重要(也最耗时)的阶段是维护。
Maintenance is an important phase of software lifecycle.
维护是软件生命周期的一个重要阶段。
In general, the active intervention period of 1.5-2 years, then go to maintenance treatment phase.
一般来讲，积极干预期为1.5 -2年，然后转到维持治疗阶段。
In general, the active intervention period of 1.5-2 years, then go to maintenance treatment phase.
一般来讲，积极干预期为1.5 -2年，然后转到维持治疗阶段。
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