Choose the Request event in the menu on the left side.
选择左边菜单中的Request事件。
A BEGIN event happens when the request first comes in.
当请求第一次传入时，即发生BEGIN事件。
The request data is wrapped inside a failed event and saved inside the common database.
请求数据被放在一个失败事件中并保存在通用数据库中。
Bidirectional, in that they are capable of event processing and request processing.
双向的，它们能够进行事件处理和请求处理。
"When" the request should be executed is when the event is emitted.
什么时候请求被执行，什么时候事件就被发出。
"When" the request should be executed is when the event is emitted.
什么时候请求被执行，什么时候事件就被发出。
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