With static dictionaries, both sides of the communication use a predefined dictionary.

使用静态字典时，通信的两端都使用预定义的字典。

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With dynamic dictionaries, the sending side can add new strings and their mappings not already in the static dictionary.

使用动态字典时，发送端可以添加其映射不在静态字典中的新字符串。

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