有两种类型的重新输入:受控的重新输入和非受控的重新输入。
There are two types of re-entries: controlled re-entry and uncontrolled re-entry.
他们通常知道哪种类型的信息必须输入到系统中,以及什么时候输入。
They normally know what kind of information must be input to the system and when.
每种类型的输入项都是一种状态的候选项。
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