Since you used NSDictionary, you created a static dictionary.

因为您使用了NSDictionary，所以您创建了静态字典。

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The LZ algorithm uses a static dictionary to store the needed information.

LZ 算法使用一个静态字典存储所需的信息。

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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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