A composite state can also have a default transition with no operation.
组合状态还可以具有不带操作的缺省转换。
This is the default transition and is taken when a successful log-in occurs.
这是缺省转换，当成功登录时，选择这一转换。
When the machine reaches a final state within a composite state, it triggers the default transition automatically.
当机器到达一个组合状态内的最终状态时，它自动触发此缺省转换。
When the machine reaches a final state within a composite state, it triggers the default transition automatically.
当机器到达一个组合状态内的最终状态时，它自动触发此缺省转换。
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