wire 这个单词经常出现，该怎么翻译？
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.
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.
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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