这类宏在被调用时，它(这里指‘…’)被表示成零个或多个符号，包括里面的逗号，一直到到右括弧结束为止。

In the invocation of such a macro, it represents the zero or more tokens until the closing parenthesis that ends the invocation, including any commas.

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比如，能够用右手的大拇指按住右鼻孔，用右手的食指或外指按住右鼻孔。

For example, your right thumb will close off your right nostril while your right index or middle finger will close off your left nostril.

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