single finger bottom tap middle 单指轻拍下边中点
single finger tap top middle 单指轻拍上边中点
finger bottom tap middle 单指轻拍下边中点
finger tap top middle 单指轻拍上边中点
two finger tip tap middle 两指轻拍住
finger tap left side middle 单指轻拍左边中点
finger tap right side middle 单指轻拍右边中点
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