Can someone tell me where is the delegate and event keyword defined?

谁能告诉我哪里是委托和事件关键字定义？

youdao

And I have read some article about event and delegate, too.

我读了一些有关事件，并委托文章了。

youdao

And I have read some article about event and delegate, too.

我读了一些有关事件，并委托文章了。

youdao