event 命令也是一个方法调用，使用 符号（定义事件名）和闭包（定义转换）作为参数。

The event command is also a method invocation, taking a symbol (which defines the event's name) and a closure, which defines the transitions.

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当Gant脚本中发生“事件”时，Grails就会调用相应的事件闭包。

The event closures are called by Grails when the corresponding "events" get generated in the Gant script.

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将值设置为debug会导致将每个事件和动作包写到日志文件。

Setting a value of debug results in every event and action packet being written to the log file.

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