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；
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；
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