子类不应该提供一旦许可被创建后改变其状态的方法。

Subclasses should not provide methods that can change the state of a permission once it has been created.

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一旦得到许可，博士塞拉·奇尼说，他希望大约一年之内完成分析。

Once he gets permission, Dr. Seracini said, he hopes to complete the analysis within about a year.

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一旦设计师得到了最后的许可，就该交付网站并取得报酬了。

Once the designer gets the final approval, it is time to deliver the site and probably get paid!

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