必需 bìxū HSK5 essential Origin Definitions Defs Strokes Stroke Words Sentences Sents bìxū essential 必 bì auxiliary must must; have to; required to; be required to需 xū noun needs necessities; requirements; essential supplies; expensesbìxū to need 必 bì auxiliary must must; have to; required to; be required to需 xū verbauxiliary to need to require; to want; to demand