本文的研究工作，得到了埃特纳火山下面的一组新的三维速度模型。
A new set of three dimensional velocity models beneath Etna volcano is derived in the present work.
利用大型有限元计算软件ANSYS进行以三维模型为基础的L型机头内部流动速度分析和模拟研究。
The FEM software ANSYS was employed to analyse and simulate the flow velocity in L shape sheet extruder die based on a three dimensional model.
针对以上问题，我们建立一个一维坐标空间三维速度空间的斜磁场作用下的等离子体鞘层物理模型。
In allusion to these problems, a plasma sheath model in an oblique magnetic field, which has one dimension coordinate space and three dimensions speed space, has been build.
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