呵呵,自夸呢?学钢琴,敲键盘有利于进制的数学概念
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• 钢琴太难,让他在学珠算 -人约黄昏后- ♀ (70 bytes) () 10/23/2016 postreply 21:07:27
• 钢琴太难,让他在学珠算 -人约黄昏后- ♀ (70 bytes) () 10/23/2016 postreply 21:07:27
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