The asynchronous call to the server will be triggered when the validate method is called.

当验证方法被调用时，对服务器的异步调用将被触发。

youdao

At an overall level this is an asynchronous sequence, since the first attach method call goes in one direction.

从全局层次上来看，这其实是一种异步序列，因为开始的attach方法调用是朝着一个方向的。

youdao

The method returns an IAsyncResult, which can be used to monitor completion, wait on the WaitHandle, or complete the asynchronous call.

这个方法返回一个IAsyncResult，它可以被用在监测完成，也可以等待在WaitHandel，或者完成异步调用。

youdao