英语语法分析

Now the surface treatment methods are surface hardening, tufftride, plasma CVD, etc.

目前常常用的表面处理方法有表面淬火、软氮化和等离子CVD等。

The test of sulphurized tufftride process for treating the hot piercing punch for steel pipes is introduced.

介绍了钢管热冲孔凸模硫氮碳共渗工艺试验。