backstrokeWiktionary 原文英美/ˈbækˌstroʊk/n.还击，反手击球，仰泳vi.还击，反手击球，仰泳vt.用反手击中文释义来自 ECDICT构词拆解backback词干strokestroke词干词源说明From back + stroke.释义名词noun1A backhanded stroke or blow.2(swimming) A stroke swum lying on one's back, while rotating both arms through the water as to propel the swimmer backwards.3(bellringing