维护费通常占一个程序年费的22%，已成为企业科研预算及软件销售收入的大部分来源。

Maintenance fees, usually 22% of a program's price per year, have become a bigger part of firms' technology budgets and of software vendors' income.

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预算管理主要以销售收入、成本费用、现金流量为重点。

The most important part in budget management are sales revenue, cost expenses, and cash circulation.

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