asynchronous finite state machine

例句：

1. 1.The server is asynchronous, so it doesn't need to wait for the client to send data before responding.
   服务器是非同步的，所以它不需要等待客户端发送数据后才响应。
2. 2. The program uses asynchronous programming techniques to improve performance.
   该程序使用异步编程技术来提高性能。
3. 3. In asynchronous programming, events are fired in response to an event that occurs on another thread or process.
   在异步编程中，事件是在另一个线程或进程中发生事件时触发的。