Rough differences between watching videos and textbooks during soft exam Review

I personally think the difference between watching videos and reading books is like watching the woods in the following two pictures:

Watch the video:

Reading:

I wonder if you understand this?

 

After watching the video, the teacher will say that this knowledge point belongs to that part. It is important and unimportant. Where is the question frequency high (that is, the tree grows secret)

 

When reading a book, you can think about a tree by yourself. It is very clear, but it is difficult to figure out the distribution of various trees.

 

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