It has an internal state variable that starts with the value EMPTY and becomes FULL as soon as an object is put into it.

它有一个内部状态变量，该变量的起始值为EMPTY，只要放进一个对象，该变量的值就变成FULL了。

youdao

This means that the UDR always returns the same value for given argument(s), and that the UDR does not modify the database or variable state.

也就是说，对于给定的参数，UDR 始终返回相同的值，而且 UDR 不能修改数据库或变量状态。

youdao

Transition 1 the value of the state variable changes in response to events.

转换1状态变量的值根据事件而相应更改。

youdao