When documenting an operation's parameters, you may use an optional indicator to show whether or not the parameter is input to, or output from, the operation.
当文档化操作参数时，你可能使用一个可选择的指示器，以显示参数到操作的输入参数、或输出参数。
The third and fourth items in the list show the difference between a tunnel parameter (when activated) and a conventional parameter with the same name.
上述第三和第四条说明了通道参数(激活的时候)和同名传统参数之间的区别。
The PERFORMER program was purposely coded without a parameter marker (?) to show what you should not be doing!
有意将PERFORMER程序编码为不具有参数标志符(？)
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