在课堂内外,经常会遇到这样的情况:有学生向我们提出一个难题,而我们一时又不知怎样回答。每每此时,可能会令我们很尴尬,但最让我们难堪的还是由自己的虚伪造成的。因为我们有时寄希望于有解决问题的突然灵感,而现实中却恰恰相反。一天下午放学时,在教学楼的东楼梯口,我碰见了 Inside and outside the classroom, we often encounter such a situation: Some students ask us a difficult problem, and we do not know how to answer for a while. At this moment, it may be very embarrassing to us, but most embarrassing to us is still caused by our own hypocrisy. Because we sometimes pin their hopes on the sudden inspiration of problem solving, the reality is quite the opposite. One afternoon afternoon, at the east stairway of the teaching building, I met