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.

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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.

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在Flex开发中使用的编程语言actionscript 3，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.

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