Protocol buffers supports optional, required and repeated fields. An example of an address book message definition using protocol buffers would look like this.
Protocolbuffers支持可选的，必需的和重复的字段。
Protocol buffers supports optional, required and repeated fields. An example of an address book message definition using protocol buffers would look like this.
Protocolbuffers支持可选的，必需的和重复的字段。
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