于光远先生曾经写过一篇短文,题目叫做《现在这样的好老师多不多》。文中写道:‘现在我只回忆一个至今不忘的经历。记不得是中学的哪一个学期了,有一天,老师抱了一摞纸和一捆尺进教室。每人发了一张纸和一把尺,要全班同学计算这张纸的面积。我想那还不容易?量一下长和宽,然后相乘就是了。我正在那么想的时候,老 Mr. Yu Guangyuan once wrote an essay titled “There are many good teachers like this”. The article wrote: ‘I’m only now recalling an experience that I’ve never forgotten. Remembering which semester of middle school, one day, the teacher held a bundle of papers and a bundle of feet into the classroom. Each person sent a piece of paper and a ruler and asked the whole class to calculate the area of ​​the paper. I think it’s not easy. Measure the length and width, then multiply it. I was thinking so old