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如果不是亲眼所见,你也许无法想像眼前这位鹤发童颜、乐观开朗的老先生,就是年逾8旬的著名数学家:步履矫健,连小伙子有时
If you do not see it with your own eyes, you may not be able to imagine this craven, optimistic and cheerful old man, who is more than eighty years of famous mathematician: vigorous, even the young man sometimes