The high-level model receives the event sent by the low-level model(s).
高级模型接收低级模型发送的事件。
Cell level: You can execute an action at the cell level by using this syntax.
单元层次：您可以使用以下的语法来执行单元层次上的操作。
Promotion of public servants to higher posts shall be done level by level.
公务员晋升职务，应当逐级晋升。
Promotion of public servants to higher posts shall be done level by level.
公务员晋升职务，应当逐级晋升。
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