杀手级应用 shāshǒujíyìngyòng killer app Origin Definitions Defs Strokes Stroke Words Sentences Sents 杀手 殺手 shāshǒu noun killer killer; murderer; professional hit man级 級 jí nounadjective level level; rank; grade; an order or position in a hierarchy应用 應用 yìngyòng noun application a practical use; in computing, an app or software program