也表示动作和状态静态的持续；

It indicates the succession of any actions and static state;

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适合任何过去持续一段时间的动作和状态，包括反复发生的动作或状态。

'Used to' is good for any action or situation that continued for a period of time in the past, including repeated actions or situations.

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表的行和列代表事件和状态，单元格内包含动作和转移。

Rows and columns represent events and states, and cells contain actions and transitions.

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