Optional and Named Parameters 可选和指定参数
Named and optional parameters are really two distinct features, but are often useful together.
命名参数和可选参数是两个截然不同的功能，但通常一起使用。
Named and optional parameters are really two distinct features, but are often useful together.
参数是两个截然不同的功能，但通常一起使用。
Dynamic lookup as well as named and optional parameters both help making programming against COM less painful than today.
动态查找以及命名参数和可选参数都有助于使针对COM的编程不再像今天这样痛苦。
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