de yu- ke xue ji shu ri yu- ke xue ji shu xie zuo- ke xue ji shu ying yu- ke xue ji shu Nong ye- ke xue ji shu nong ye- ke xue ji shu Chu mu ye- ke xue ji shu chu mu ye- ke xue ji shu Guo fang ke xue ji shu guo fang ke xue ji shu