coin tail

例句：

1. 1. The coin tail on the coin is very shiny.
   硬币上的尾巴非常闪亮。
2. 2.The coin tail was used to attach the coin to the chain.
   硬币尾巴用于将硬币连接到链条上。
3. 3. The coin tail was designed to make it easier for people to identify the coins.
   硬币尾巴的设计是为了使人们更容易识别硬币。