The business objects are sometimes referred to as the currency of the application, because all of the services use them.
业务对象有时候被称为应用程序的货币，因为所有的服务都要使用业务对象。
Clearly separate non-numeric symbols such as currency signs and tax application markers from the currency values.
将非数字符号，比如货币符号和税务应用程序的标记，与货币值清晰分开。
Listing 9 contains the code for the currency exchange application in its entirety.
清单9包括货币兑换应用程序的全部代码。
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