He's a famous mathematician. Great guy.
大数学家，不得了！
After studying so hard to learn, later, became a famous mathematician.
也就是经过这样勤奋学习再学习，后来，成为了著名的数学家。
He is a famous ancient Chinese hydraulic engineer and mathematician.
郭守敬是中国古代著名的水利工程师和数学家。
He is a famous ancient Chinese hydraulic engineer and mathematician.
郭守敬是中国古代著名的水利工程师和数学家。
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