1. we shall not overstudy or overwork , especially to those students who had already very tired but still keep on learning, it can but make ourselves even tired, and will be in hot water ,whether to contnue to learn or have a rest , at last it will result in double personality ;
2. we shall not think to much of those cut and dried history issues , unually speaking , those person of double personality are very easy to get into the dead end , and there is no any use on the solution or result of the practical problems , only make the sufferer even pain