鍾老師珠心算補習班-珠算教學 - YouTube

珠心算教學示範 ... 珠心算 1 - Duration: 51:46. by teresa zhu 22,622 views 51:46 Play next Play now Abacus Lesson 1 // Introduction, Proper Technique, & History of the Abacus // Tutorial - Duration: 8:31.

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