phīn-phōng-siû乒乓泅

backstroke

backstroke (a swimming stroke swum on one's back)

English Wiktionary, “乒乓泅” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E4%B9%92%E4%B9%93%E6%B3%85 · confidence: Medium (Wiktionary)