3．
Long ago，there lived a learned man in Greece．He was well-knownfor（76）his wide knowledge．And lots of people from all over the country came tolearn（77）things from him．The great man taught his students with all his heart andanswered（78）their questions with great patience．
One day a studentasked（79）him，"My dear teacher，didn't you say you have many more questions than we do？But we think we students have a lot more than you．"With asmile（80），the teacher drew two circles-one is aslarge（81）as a big plate （盘子），and the other smaller．
"Of course，I've learned much more．But I don't think I know all you know．Now，look at these two circles．Inside the big one is my knowledge of things，and（82）inside the smaller one yours．Out of the circles is what we don't know．My circle is larger，so its line is longer．Thatmeans（83）I have more opportunities to meet with what we don't know．And that'swhy（84）I myself have more questions than you do．The more you learn，the morequestions（85）you'll have．You will never learn enough，you know．"
