退出队列是一个单线程操作，即使消息流本身配置为多实例时也是如此。
Dequeuing is single threaded, even if the message flow itself is configured for multiple instances.
其他包含不止一个输入的DB 2操作(连接)也是单线程的。
Other DB2 operators with more than one input (joins) are also single-threaded.
在Flex开发中使用的编程语言actionscript3，根本上是单线程的，对于所有的网络操作都需要异步的来完成功能。
ActionScript 3, the programming language used in Flex development, is fundamentally single-threaded, and requires asynchronous completion functions for all network operations.
但不幸的是，上面的代码违背了UI线程的单线程模式：Android UItoolkit不是线程安全的，所以对UI的操作都应该在主ui线程中进行。
Unfortunately, it violates the single-threaded model for the UI: the Android UI toolkit is not thread-safe and must always be manipulated on the UI thread.
但不幸的是，上面的代码违背了UI线程的单线程模式：Android UItoolkit不是线程安全的，所以对UI的操作都应该在主ui线程中进行。
Unfortunately, it violates the single-threaded model for the UI: the Android UI toolkit is not thread-safe and must always be manipulated on the UI thread.
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