The article has introduced the cross wedge rolling preforming technology and its die design.

介绍了楔横轧制坯工艺及其模具设计。

Learning from a class or book is a must; but it doesn't compare to actually preforming the procedure.

学习一类或书是必须；但不预成形比较实际的程序。

In this paper, the preforming processes of 915kkd train wheels was simulated using rigid-plastic FEM software TFORM2.

采用刚塑性有限元模拟软件TFORM 2模拟了915kkd快速车轮的预成形过程。

If you are preforming a clean istallation, you'll need to burn this onto a blank DVD before you can install Windows 7.

如果你是没有预装系统，那么在你安装Windows 7之前，你将需要将这个文件刻录到一张空白的DVD中。

In the future, do you prefer to record your own written songs, or wouldn't you mind preforming other peoples lyrics as well?

未来你会选择录制自己写的歌，还是同样不介意演绎别人的歌词？