幸运的是，那时我遇到了一个30岁的林业工作者加代尔·桑切兹·里维拉(Gadiel Sanchez Rivera)——他被称为曹(Cho)。他同意做我的向导。
Fortunately, it was at that point I met a 30-year-old forestry worker called Gadiel Sanchez Rivera - known as Cho - who agreed to take over as my guide.
曹怀东与朱熹平的文章中充分肯定了佩雷尔曼的工作对于证明庞加莱猜测所起的重要作用，同样，佩雷尔曼在文章中也明确指出他的工作是建构于前人的众多贡献基础上的。
They fully acknowledge Perelman's role in the completion of the proof of Poincare conjecture and likewise Perelman has acknowledged the work of previous researchers on which it's based.
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