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Once again this is really just a function on the queue object.
再次声明这仅仅是一个队列对象的函数。
youdao
The name of the Queue object which defines the message destination.
以及定义了消息目的地的Queue对象的名称。
A data queue object is used to send data from one program to another.
一个数据队列对象用于将数据从一个程序发送到另一个程序。
If theABAddressBookRef object is used throughout the app, then all usage must be dispatched to the same queue to use ABAddressBookRef in a thread-safe manner.
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