There is no explicit variable for the message instance in the code; it is inferred.
在代码中没有为消息实体做显式变量声明;它是被推断出来的。
The flow overrides the dummy map at runtime based on the country code in the incoming message.
该流在运行时根据收到消息中的国家代码重写虚拟映射。
The fact that the API remains common across message types encourages code reuse even in environments where the message types are completely different.
此api可以对多种消息类型进行公共访问这一事实可促进代码重用,即使在消息类型完全不同的环境中也是如此。
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