The result of this call is returned by the function literal.
调用的结果会被函数返回。
An expression to represent which related object should be returned by the function.
表示函数应该返回哪个相关对象的表达式。
The only missing piece is the construction of the binary string to be returned by the function.
惟一缺少的部分就是函数所返回的二进制串的构造。
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