逾期费的交互表现为一个交替流或例外流。
The late-fee interaction would represent an exception or alternate flow.
但是如果顾客在上次租借中欠了逾期费怎么办？
But what if the customer owed a late fee from a previous rental?
我会多租一天来看，然后付逾期费。
I'll rent it for another day, and then pay for the demurrage.
在我们的示例中，如果顾客付了逾期费和这次的租金，那她就达到了继续租借录像带的目的了。
In our example, if the customer paid her late fees and the rental fee, she would achieve the goal of renting the video.
例如，“支付逾期费”（Pay Late Fee）用例描述了录像带出租系统的用户遇到要支付逾期费这种情况时会发生的事。
The Pay Late Fee use case, for example, describes what happens to a user of our Video Rental system when he encounters a late fee.
例如，“支付逾期费”（Pay Late Fee）用例描述了录像带出租系统的用户遇到要支付逾期费这种情况时会发生的事。
The Pay Late Fee use case, for example, describes what happens to a user of our Video Rental system when he encounters a late fee.
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