ysh怎么记

A few months ago I went to Bolsover, a former mining town in Derbyshire whose economy looked fairly good on paper.

几个月前，我去了德比郡（Derbyshire）一个曾经的煤矿小镇博尔索弗（Bolsover），那里的经济数据看上去相当不错。

Bi-orthogonal eigen-function systems were assigned to launch such a sophisticated problem, and Chebyshev collocation method gained its power in the numerical procedures.

建立问题的双正交系统，并应用Chebyshev配点法对模型问题进行数值求解。

With the relationship of the first chebyshev polynomials and Locus number, the sum of products of Lucas number m-power is obtained with some elementary methods.

根据第一类Chebyshev多项式与Lucas数的关系，用初等方法得到了关于Lucas数m次幂的积和式。