病毒营销 bìngdúyíngxiāo viral marketing Origin Definitions Defs Strokes Stroke Words Sentences Sents 病毒 bìngdú noun virus a type of tiny microorganism that causes infection and can only reproduce inside the living cells of a host营销 營銷 yíngxiāo nounverb marketing the action or business of promoting and selling products or services