提出了利用正四面体的某些截面表示一定组成，得出相分离曲线和相分离曲面，并能较好地描述四元体系。
Some of the cross sections are used to stand for a certain component, and semiternary phase diagrams are ploted, then a quaternary phase diagram shown in a tetrahedron is obtained.
文中利用了两种对非规则边界参数区域进行拟合的方法，对同向双螺杆挤出机四面体间隙进行了拟合，并建立了一种曲面拟合误差测量的新方法；
Two methods were applied to fit surfaces of the tetrahedral gap of an intermeshing co-rotating twin-screw extruder. The surfaces are irregular border's parameter domain.
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