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。
In this article, you learned a few asynchronous communication techniques and how you can add JSON and Ajax to business-line applications through reusable JSP TagLib controls.
在这篇文章中，您学习了一些异步通信技术，了解了如何通过可重用的JSP TagLib控件为业务线应用程序添加json和Ajax。
But asynchronous machine is a multivariate close coupling non - linear time - variable parameter system. And it is difficult to control by rule and line through adding exterior signal directly.
而异步电机是一个多变量、强耦合、非线性的时变参数系统，很难直接通过外加信号准确控制电磁转矩。
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