英语语法分析

The result indicates that the fracture of the drive countershaft is fatigue fracture.

结果表明，传动副轴的断裂是疲劳断裂。

Gear a, at the end of the drive shaft, and gear B, on the countershaft, are in constant mesh.

齿轮A位于驱动轴的末端，齿轮b在副传动轴上，它们恒定啮合。

Use of mathematical tools unifies counter point angular momentum and countershaft angular momentum.

利用数学工具将对点的角动量和对轴的角动量统一起来。