当控制权进入宣告区域变数的程序时，区域变数的存留期即开始。
A local variable's lifetime begins when control enters the procedure in which it is declared.
这个类别会借由取得合约的存留期语汇基元，提供增益集参考计数机制。
This class provides a reference counting mechanism for the add-in by obtaining a lifetime token to its contract.
委派可以选择性引发事件，以便告知用户端，非同步工作的存留期已结束。
Your delegate can optionally raise an event that notifies clients that the asynchronous task's lifetime has ended.
由于回收之后存留下来的物件通常具有较长的存留期，因此才会将它们提升至较高的层代。
Because objects that survive collections tend to have longer lifetimes, it makes sense to promote them to a higher generation.
请注意，电脑可以传送要求给DHCP伺服器以延长使用期，因此使用存留期可能会随著时间而变长。
Note that the computer can send requests to the DHCP server to extend its lease, so the lease lifetime can increase over time.
WPF有四种主要的物件类型与存留期事件相关，分别是一般项目、视窗项目、巡览装载和应用程序物件。
There are four main types of objects in WPF with respect to lifetime events; elements in general, window elements, navigation hosts, and application objects.
如果使用者必须在专案存留期的整个期间执行一般工作，您应该考虑将该使用者加入至现有的群组或新群组。
If the user must perform common tasks through the lifetime of the project, you should consider adding that user to an existing group or to a new group.
如果使用者必须在专案存留期的整个期间执行一般工作，您应该考虑将该使用者加入至现有的群组或新群组。
If the user must perform common tasks through the lifetime of the project, you should consider adding that user to an existing group or to a new group.
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