他在图书馆看一本数学教科书。
数学的观点扎实且非常有洞见，从任何角度来看，都是图书馆非常好的藏书。
Mathematically solid and very insightful. A great addition to a library in any case.
数学的观点扎实且非常有洞见，从任何角度来看，都是图书馆非常好的藏书。
Mathematically solid and very insightful. A great addition to a library in any case.
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