Meanwhile textbooks that have no instructions carefully, it seems a matter of course but the actual scientific principles inherent in the place, nor does it explain in class.
At the same time, the textbook sits on some places that are not carefully explained, which seem to be taken for granted but actually contain scientific principles, are not explained in class.
At the same time, there are some things that are not explained carefully in the textbook, which seem to be natural but actually contain scientific principles, which are not explained in the class.<br>