Design diagrams are crossed off rather than updated. This is better than leaving the design out of date.
设计图被划掉而不是更新，这样好过保留过时的设计。
The API methods I'll show you for doing date calculations all return a new instance of the corresponding Joda class, leaving the original instance unchanged.
我将向您展示的用于处理日期计算的API方法全部返回一个对应joda类的新实例，同时保持原始实例不变。
Receptionist: let me see... Oh, here, Sir. You forgot to put in the date of your departure. Here let me fill it in for you. You're leaving on...?
接待员：我看看…，噢，这里。您忘记填写退房日期了。我来帮您填上吧。请问您退房的日期是…？
Receptionist: let me see... Oh, here, Sir. You forgot to put in the date of your departure. Here let me fill it in for you. You're leaving on...?
接待员：我看看…，噢，这里。您忘记填写退房日期了。我来帮您填上吧。请问您退房的日期是…？
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