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.
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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