我发现老师每次改作业,手都会感觉很累。我想为老师发明一种批改作业的小机器。这种机器在每次批阅作业时,能把所有同学在作业中出现的错误、优点和缺点都统计出来,并且不会出现差错,而且速度非常快。这种机器工作时,老师只要把所有的作业本往里一放,几分钟后,就能拿到全部用自己的红色字迹批 I found that every time I change homework, my teacher will feel tired. I want to invent a small machine for the teacher to change the homework. Such a machine can count all the errors, strengths and weaknesses of all the students in homework assignments every time they read the homework, and it will not go wrong, and it will be very fast. When working on this type of machine, the teacher simply puts all his homework in and a few minutes later, he can get all his own red handwriting