关于状态图的一个选择题，求大神指点。。。。。

Question

根据状态图术语，以下关于“事件”的陈述是否错误？

1. 这是一种可能导致软件产品进入其他状态的事件。
2. 在电梯问题案例研究中，“按钮推送”是一个事件的例子。
3. 事件作为状态之间转换的标签包含在UML状态图中。
4. 每个状态之间的转换都必须标注一个事件。

It is an occurrence that can cause the software product to go into some other state.

In the Elevator Problem Case Study, "button pushed" is an example of an event.

Events are included in a UML statechart as labels on transitions between states.

Every transition between states must be labeled with an event.

Answer 1

看上去“In the Elevator Problem Case Study, "button pushed" is an example of an event.”可能不对，因为按下按钮未必会改变状态。