In a reference counting system, each object referenced maintains a count of how many objects are referencing it.
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.
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。
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