保留到反射对象的引用会造成这些类保持为活动状态并继续占用空间。
Holding references to the reflecting objects causes these classes to stay alive and continue occupying space.
在引用计数系统，每个所引用的对象都会保留一个计数，以获悉有多少对象正在引用它。
In a reference counting system, each object referenced maintains a count of how many objects are referencing it.
控制器保留对模型主实例的引用。
The controller keeps a reference to the primary instance of the model.
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