Pluck then slowly press a string at the same time to slide to the next higher note, then slowly relax the left hand for a returning downward slide. Ferguson offers two variants of this: Tèshū huáyīn 特殊滑音 “Extraordinary Slide”, a slow version, and gāo huízhuǎn huáyīn 髙回转滑音 (trad. 髙回轉滑音) “High Returning Slide”, A fast version played in half the time. Kao offers the Henan term Shuāng huáyīn 双滑音 “Double Slide”.