求大神解答……
file:///D:\My Documents\Tencent Files\814551231\Image\3FPYZ01T$%3W3file:///D:\My Documents\Tencent Files\814551231\Image\3FPYZ01T$%3W3file:///D:\My Documents\Tencent Files\814551231\Image\3FPYZ01T$%3W3 跪求解释,7,5之间击弦下面那个小数字是什么意思? 击勾弦 .
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