每一个字符串(由宏扩展而成)表示了尖括号内的一个整数。数值范围从0到7，数值越小，优先级越高。
Each string (in the macro expansion) represents an integer in Angle brackets. Integers range from 0 to 7, with smaller values representing higher priorities.
每一个字符串(由宏扩展而成)表示了尖括号内的一个整数。数值范围从0到7，数值越小，优先级越高。
Each string (in the macro expansion) represents an integer in Angle brackets. Integers range from 0 to 7, with smaller values representing higher priorities.
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