The main structures: axial press tight at left direction, radial advance and retreat, 90o overturn, axial press tight at right direction, movable frameadvance and retreat, lift up and down.
测试机主要结构，左向轴向压紧，径向进退，90度翻转，右向轴向压紧，移动架进退，上下升降。
2
Try to visualise any scene in advance; if your subject is walking, have the animal leading into the picture and use prominent natural features to frame the shot.