本文在超文本学习状态空间中引入逆连接，从而在超文本状态空间的数学模型框架中，引入虚拟答疑概念，并给出一个问题答疑算法。
We define inverse links in hypertext learning state space and define virtual teacher concept. Then we get a seeking answer method in hypertext learning state space.
结合英语俱乐部、外教答疑、商务课程和专业的个人学习顾问的指导，开创了高效英语学习的全新模式。
With a combination of English club, Q&A, business class and the help from tutors, Canilx has created an effective studying mode of the students.
在学校里老师为我们解答疑难问题，在学习上给于我们很大的帮助。
Teachers at school to answer our difficult problems in learning to our great help.
它分为：在线学习、作业提交、课程实验、问题答疑、例题解析、试题样卷、在线通知等块。
It is divided into: on-line learning, submitted to the operation, the experimental course, answer the question, to resolve example, the test sample volumes, such as on-line to inform the block.
在客户端，用户可以在该系统中自助注册，自助购买，自助学习，自助测试，自助答疑。
At the client, the user can be registered in the system self-help, self-purchase, self-study, self-testing, self-service and Q&A.
在客户端，用户可以在该系统中自助注册，自助购买，自助学习，自助测试，自助答疑。
At the client, the user can be registered in the system self-help, self-purchase, self-study, self-testing, self-service and Q&A.
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