约束 Traditional (Taiwan): 約束 On the HSK 5 vocabulary list, at CEFR level C1. yuēshù ㄩㄝ ㄕㄨˋ to restrict to limit to to constrain restriction constraint 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