它忽略了金钱的时间价值——折扣率。

It ignores the time value of money — the discount rate.

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金钱的时间价值：今天的一块钱比明天的一块钱更有价值。

Time value of money: a dollar today is worth more than a dollar tomorrow.

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一些更为先进的系统则利用了工程经济原理，把项目决策中金钱的时间价值也包括了进去。

Some of the more sophisticated systems apply the principles of engineering economy to include the time value of money in project decision making.

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