fixed plane meaning in English

固定面
固定平面

Now , since the aperture can only be inserted in the one fixed plane it follows that the first image should be formed in this plane and the diffraction lens focused on to it
现在，由于孔可以仅仅被嵌入所属的一个指定的平面，第一成像就应该出现在这个平面并且衍射透镜聚焦在其上。
If the planar failure arises without fixed plane in rock slope , the critical inclination of failure face is not only the function of slope angle and friction angle of failure face , but also the function of the height of failure part , the cohesion of failure face , and unit weight of failure body
摘要在岩石边坡中，当出现平面滑坡时，如果边坡内没有确定的滑面，滑面的临界倾角不仅仅是边坡倾角和破坏面摩擦角的函数，而且还应该是滑体高度、破坏面的黏聚力和岩体重度的函数。