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為什麼「八度」很重要,以及住在希臘的聰明男人
by NiceChord+ (好和弦+)||77,539 views
Ch 4.3.1 Trig Identities
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by แมทเล่าให้ฟัง | MLHF||62,695 views
Angles by Daniel Kelly (Filk)
by Daniel Kelly Folk Music||58 views