必須 Simplified: 必须 On the HSK 2 vocabulary list, at CEFR level A2. bìxū ㄅㄧˋ ㄒㄩ to have to must compulsory necessarily Where 必須 is used Example sentences and grammar articles using 必須 Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0 国际中文教育中文水平等级标准, 中华人民共和国教育部, MIT