在本例中，我们将研究公司如何使用业务规则来定义计费规则，将那些规则外部化并动态地修改它们。

In this example, we examine how a company USES business rules to define the billing rules and to externalize and modify them on the fly.

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然而，也不乏一些广告公司现已自觉废除了小时计费方式，转向用价值计费的方式。

But some advertising agencies have voluntarily moved away from billing by the hour and towards contracts that reward value.

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差别在于，应付账款是公司从其他企业处收取的账单，而应计费用则是公司预计即将收取账单而建立的会计分录。

The difference is that accounts payable are for bills the company receives from other businesses. And accrued expenses are accounting entries a company makes in anticipation of being billed.

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