The value of the last expression is the default return value of a function.
最后一个表达式的值是默认的返回值。
The value of expression, if the expression is present, is returned to the calling function.
表达式的值（如果表达式存在的话）将返回到调用函数。
The value of expression, if the expression is present, is returned to the calling function.
表达式的值（如果表达式存在的话）将返回到调用函数。
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