单词	ejection pin
释义	ejection pin 推顶销
随便看	principal plane of extraordinary rays principal plane of flexure principal plane of glide principal plane of inertia principal plane of ordinary rays principal plane of photograph principal plane of stress principal-plane of stress principal plane of symmetry principal plane pattern principal planes principal planes of bending principal planet principal planets principal player principal plot principal plotter principal point principal point angle principal-point assumption principal point error principal point location principal point of curvature Principal point offset principal point of objective