Many teenagers enrolled in this on-line course.
很多青少年注册报名参加这门网络课程。
The fourth part analyzes different types of on-line course, forms the common essential factor saying of on-line course structure, and specifically elaborates elements of on-line course structure.
第四部分分析不同类型的网络课程，形成网络课程结构共同要素说，并对其结构要素进行具体论述。
The fourth part analyzes different types of on-line course, forms the common essential factor saying of on-line course structure, and specifically elaborates elements of on-line course structure.
第四部分分析不同类型的网络课程，形成网络课程结构共同要素说，并对其结构要素进行具体论述。
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