我们先来看四则案例: 第一则:某老师给学生当面批改作业,学生们都自觉排队。第一个同学交上本子,老师看到本子边角卷了,便停下笔,先抹平了本子再动手批改。第二个学生交上本子,老师又看到本子的边角卷了,便又先抹平了本子才动笔批改。这时,第三个学生看在眼里,赶紧自觉地抹平了 Let’s look at four cases first: First, a teacher corrects assignments for students and students consciously line up. The first classmate handed in the book. When the teacher saw the corner of the book, he stopped the pen and wiped out the book before proceeding to make corrections. The second student handed in the book, and the teacher saw the corner of the book again, and then he wiped out the book before he wrote it. At this time, the third student looked in the eyes and quickly consciously wiped it out.