As the most costly and complex phase in software product 's life cycle, software maintenance has a direct and important effect on the quality and reliability of software products.
软件维护作为舰艇装备软件生命周期中费用最高、工作最复杂的一个阶段，对软件产品的质量和可靠性均有着直接而重要的影响。
Unearned revenue due to undelivered elements is recognized ratably on a straight-line basis over the related product ' s life cycle.
尚未完成交付而记入不应得的收入账目的金额应采用相关产品的生命周期直线法来应征税收。
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