wire 这个单词经常出现，该怎么翻译？
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You can never safely add a required field to a .proto definition, nor can you safely remove an existing required field because both of these actions break wire compatibility.
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When parsing from the wire or when merging, if there are duplicate map keys the last key seen is used. When parsing a map from text format, parsing may fail if there are duplicate keys.
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The map syntax is equivalent to the following on the wire, so protocol buffers implementations that do not support maps can still handle your data:
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