- 1. must be kept constant: 必须保持不变
dict.youdao.com - 2. Classrooms must be kept clean: 必须保持教室清洁
dict.youdao.com - 3. promises must be kept: 说话要算数
dict.youdao.com - 4. a promise must be kept: 一言为重
dict.youdao.com - 5. Character must be kept bright: 必须保持光明正大的品格
dict.youdao.com
有道词典