union tail

例句：

1. 1.The union tail is a crucial part of the design.
   联合尾部是设计中至关重要的部分。
2. 2.The tail of the animal was long and curved.
   动物的尾巴长且弯曲。
3. 3. The tail of the swan is unique and beautiful.
   天鹅的尾巴独特且美丽。