In the last two decades of his life, he Shifted pure mathematics areas from applied mathematics areas.
在其人生最后二十年间，从纯数学领域转向应用数学领域。
To activate mathematics education into daily life should not only link mathematics with life but also pay attention to the upgrade from everyday mathematics to school mathematics.
数学教育生活化不仅要密切数学与生活的联系，还要注重日常数学到学校数学的提升。
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