It's a common practice that the costs for maintenance are cumulated during the lifetime of a system without controlling the amount and without differentiating between the different kinds of costs.

常用的做法是将维护所需的费用计算在系统生命周期之内，而对费用的总量不加以控制，并且也不区分各种费用之间的区别。

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It's a common practice that the costs for maintenance are cumulated during the lifetime of a system without controlling the amount and without differentiating between the different kinds of costs.

常用的做法是将维护所需的费用计算在系统生命周期之内，而对费用的总量不加以控制，并且也不区分各种费用之间的区别。

youdao