单弦竖琴，知道这是干嘛的吗？
https://link.storjshare.io/raw/jvrkr6btncdcnohvhuj2xtxixz3a/production/509c321d7bfee5330930ff0f38c73d4d053d35c05466e4fc2eadd958dafff413.MP4
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弹棉花
