The two Alternative instances are used in different circumstances to wait for guards to get ready, with the order of listing being the implicit priority orders.
两个Alternative实例被用在不同的情况下等候警卫就绪，列表的顺序是隐式的优先级顺序。
The two Alternative instances are used in different circumstances to wait for guards to get ready, with the order of listing being the implicit priority orders.
两个Alternative实例被用在不同的情况下等候警卫就绪，列表的顺序是隐式的优先级顺序。
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