a gold coin

• 一枚金币

a gold coin的用法和样例：

例句

1. A gold coin fell out of the envelope.
   一枚金币从信封里掉了出来。
2. His ease were suddenly disturbed by a coin flying into his carriage and ringing on the floor.
   一枚金币忽然飞了进来，当啷一声落在车厢的地上，把他的安闲给搅扰了。