前一节介绍的身份验证方法是用户级安全措施。
The authentication described in the previous section is user-level security.
我每次更换后级电子管的时候是不是必须把前级管也一起换？
Do I need to replace my driver tube every time I replace my power tubes?
她小学六年级辍学，她的前三个孩子和她的情况差不多。
Her education stopped in sixth grade, as did that of her first three children.
凤凰作为前级远超过我的期望。
或者姚明在受伤前打出的是MVP级的数据？
或者姚明在受伤前打出的是MVP级的数据？
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