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在古代,人们把不计身份而结交的朋友成为“杵臼之交”。我想,以此来形容我和杨兰春老师的交往也许是恰当的。论年龄,他长我50多岁,算得上爷爷辈
In ancient times, people became friends with friends regardless of their status. I think it may be appropriate to describe my contacts with Professor Yang Lanchun. On age, he grew more than 50 years old, count as my grandfather generation