• 1. mandatory level: 基准面 | 标准等压面 | 基准
• 2. Mandatory Control Level: 强制控制层次
• 3. mandatory support level: 强制支持等级

• 1.Schools offer a series of vocational-technical and university preparatory tracks involving one to three additional years of education beyond the minimum mandatory level.
  学校提供一系列的职业技术和大学预备规划包括1 - 3年的超过最低强制水平的附加性教育。
  dict.yoduao.com
• 2.However, I do not believe that there is a need to make class attendance mandatory at the university level.
  然而我认为，到了大学阶段，就没有必要强制规定学生上课一定要出席。
  dict.yoduao.com
• 3.Level 1 is mandatory for all implementations and provides read access to the repository, which in short means.
  对于所有实现，级别1是必须的，它提供对仓库的读访问，简而言之。
  dict.yoduao.com

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