It is not, however, a sign that they're getting serious about transforming the postal system for the 21st century.
但是，这并不表示他们正认真考虑为21世纪改革邮政系统。
2
In fact, usually the system blocks anyone trying to sign up for a class they shouldn't be taking, who hasn't taken the courses you are required to do first as prerequisites.
事实上，这个系统通常会阻止任何想要注册他们不应该选的课程的人，也就是那些没有选必选先修课程的学生。
3
It also analyzes the function of minitype personnel signsystem and the procedures of design and realization.