Every general-purpose computer has its own unique instruction repertoire. 每台通用计算机都有其独有的指令系统。
Web-based instruction is characterized by the physical separation of the teacher and the learner, therefore, web-based learning demands students of greater autonomy and a repertoire of language learning strategies. 网络教育的本质特点是教师与学生在教学环境中的分离,因此,学生必须具备自主学习的能力并学会使用各种学习策略。