他断言，在理解冗长且完全抽象的一系列观点方面，他的能力非常有限，因此他深信自己在数学上永远不会成功。
He asserted that his power to follow a long and purely abstract train of thought was very limited, for which reason he felt certain that he never could have succeeded with mathematics.
基于数学模型进行的科学研究表明，限制旅行对制止疾病蔓延效果有限或没有效果。
Scientific research based on mathematical modelling indicates that restricting travel will be of limited or no benefit in stopping the spread of disease.
基于数学模型进行的科学研究表明，限制旅行对制止疾病蔓延效果有限或没有效果。
Scientific research based on mathematical modelling shows that restricting travel would be of limited or no benefit in stopping the spread of disease.
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