用例事务的“环形路线”方法，在估算用户界面复杂性方面显示出其价值。
The "round trip" approach to use case transactions shows its value in the case of estimating the complexity of user interfaces.
当价值估算按照服务协议中指定的那样完成时，方法必须调用 InvoiceProcessing 接口的 processInvoice 操作。
The method must also invoke the processInvoice operation of the InvoiceProcessing interface when the price calculation has been completed as specified in the service protocol.
目前对人的生命经济价值的估算方法基本上可以分为两大类：人力资本法和支付意愿法。
At present, there exist two approaches to the economic valuation of life: human capital and willingness to pay (WTP).
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