symmetry welding

例句：

1. 1. Thesymmetry of the design is what makes itso beautiful.
   设计中的对称性是它如此美丽的原因。
2. 2. In symmetry welding, the two pieces are joined together withoutany gaps.
   在对称焊接中，两个部件没有间隙地连接在一起。
3. 3. Thesymmetry welding technique is used tocreate a seamless look in furniture.
   对称焊接技术用于家具上创造无缝外观。