关于 PDMS mannual ? access control data, which defines those databases which are accessible to any specific user and whether he may modify them or only look at them。 访问控制数据定义了可以访问这些数据库的用户及他们的更改或只读权限。查看更多
that从句翻译？ it is an essential requirement for ensuring the constant function and readiness for operation of the rotary valve that a stock of the most important spare and wearing parts is kept at the site of installation. it 为形式主语，真正的主语是后边的 that 从句， for ensuring 句是 目的状语。翻译时按中文习惯把状语放在前面。 ----- 为了确保旋阀功能稳定并且已作好运行准备，把最重要的备件和损耗件存放在安装现场，这是基本要求。 ---------------------------------fyi 查看更多
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