当执行优化的动态编译器做出的假设已经过时时，就会发生这种情况。
This can happen when assumptions made by an optimizing dynamic compiler have become outdated.
库克写道，“这份建议是永不过时的，而且时时提醒我们：只有前进，我们才能做出伟大的工作，并让这个世界变得更好。”
This advice is timeless, and a reminder that we only do great work and improve the world by moving forward.
当漫游移动用户在GLR中的位置信息错误或过时时，对该用户的入呼将失败。
When the location information of a roaming user in a GLR is incorrect or obsolete, the incoming calls before recovery will be lost.
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