The wheel and axle is a rotating lever.

轮轴是一个转动的杠杆。

The wheel and axle is really a sort of lever.

轮轴实际上是一种杠杆.

Aim To realize optimized construction and volume of rail wheel and axle in complex loads with finite element analysis.

目的通过对火车轮轴在复杂载荷作用下的有限元分析，实现火车轮轴结构与体积的优化。