用FEM进行人颅颌面生长发育研究，其结果是恒定的，与坐标系的选择和参照平面无关。
The results achieved by FEM were stable, and irrelevant to coordinate system and reference plane.
平面度是几何量测量中的一个重要参数。测量得到的平面是利用理想平面作为基准，使其它计量器具有相应的参照平面，从而对其平面度进行评定。
Measured its ideal plane as the main benchmark as the frame of reference for other gauges, the evaluation of its flatness is the most important index.
当地球沿着轨道绕太阳公转的时候，从平面这边的下端开始，以地球为参照物，这也能看成太阳沿着轨道绕我们运转。
We can also imagine that while the Earth orbits around the sun, from down here on the surface, it can look like the sun orbits around us.
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