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。
There is no explicit variable for the message instance in the code; it is inferred.
显式类型语言要求声明每个变量和每个函数参数。
A manifestly typed language forces you to declare each variable and each function argument.
变量的显式类型化(即将变量声明为 String或 Collection) 依然是可选的。
Explicit typing of variables (that is, declaring a variable as a String or Collection) is still optional.
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