但是在钢轨的内侧面，由于车轮经常滑动和重力延缓了保护层的生成。

But at the gauge face of the rail, high levels of slip and gravity inhibit the formation of protective layers.

youdao

但是在钢轨的内侧面，由于车轮经常滑动和重力延缓了保护层的生成。

But at the gauge face of the rail, high levels of slip and gravity inhibit the formation of protective layers.

youdao