The general layout and imagery of this entire design features reflection symmetry, yet each element individually holds a lot of uniqueness and lack of symmetry.
这个页面的整体布局和图像设计特点是反射对称。然而单独来看，每个元素又是独一无二的，不对称的。
2
Based on theories of computational fluid dynamics and heat transfer, an axial symmetry finite element model of velocity and temperature field of spot welding for aluminum alloy is established.
The stability of the end slopes, i. e. concave slopes has been analysed with modelling and by means of the finite element method in axial symmetry system.