An asynchronous message is drawn similar to a synchronous one, but the message's line is drawn with a stick arrowhead, as shown in Figure 6.
一个异步消息和一个同步的画法类似，但是消息画的线带一个棍形矛头，如图6所示。
Each message is published, along with an asynchronous callback listener, to a message bus residing on the business tier.
每条消息连同异步回调侦听程序一起被发布到驻留在业务层的消息总线。
If it's set to 1, you know the request was made using an asynchronous Ajax call, and you should just send back a message with OK or an error.
如果该字段设置为1，则表明请求是通过使用一个异步ajax调用发出的，您应该只返回一条包含OK或一个错误的消息。
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