一、问题的提出记得还是在大学读书的时候，一次和日本专家一起去吃小笼包子，吃着吃着脱口说了一句：　　　　　　　　　　　而专家告诉我这时应该说：　　　　　　　　　。当时我并没有细想其中的道理，但是现在既然已经为人师，就不得不设法弄清楚其所以然了。从上述事... First, the problem raised Remember when I was in college or study time, and a Japanese expert to eat dumplings, eat and eat blurtedly said: and experts told me at this time should say :. I did not think about the truth at that time, but now that I am already a teacher, I have to try to figure out why. From the above ...