Because it is easy to study, unlimited time, split time with ease. When we do not understand the subject or content, students can look back to understand better the original As well as convenient for finding information, but also has disadvantages.We can't ask the teacher directly
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It 's easy to learn unlimited split, times easily. When we do not understand the topic or content that students can refer. Back to the original point to understand more. As well as easy to find as well. But there is a downside If we do not really. Understand We can not ask the teacher directly.
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