Ben shu gen ju yuan guo jia jiao wei mian xiang 21 shi ji jiao xue nei rong he ke cheng ti xi gai ge de yao qiu, cong gao deng shi fan yuan xiao de te dian he xu yao chu fa, ba jie xi ji he he she ying ji he ji ji he ji chu jian jie he wei yi ti, gong fen jiu zhang jia san ge fu lu.