It is not just grain itself: electricity and fuel for threshing and transport are also short.

The whole village has been working day and night gathering and threshing this year's crop before the September rains.

The students, whose levels range from kindergarten to 10th grade, are also learning to grow and thresh rice and how to make ceramics and paper from materials found on the school site.

She usually taught women only. Yet she was glad when men listened outside the paper-covered windows, or at the edge of the threshing floor where women learned while they worked.

On the same time, this study has great theoretical significance and practical value to improving the performance of the combine, promoting replace of products and developing the new threshing unit.