以上来源于: WordNet
The third pinpoints methods with a void return type.
第三个用来确定一个空返回类型。
For each method in your original interface, the asynchronous version must have a matching method with the return type changed to void and an additional parameter of type AsyncCallback.
对于初始接口中的每个方法，异步版本必须有一个返回类型更改为void的匹配方法和一个asynccallback类型的附加参数。
Also note how all the calls have been made asynchronous, meaning they have a void return type.
另外还要注意，所有调用实现异步的方式，这说明这些调用拥有void返回类型。
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