numismatician

例句：

1. 1. He is a numismatician who loves to collect ancient coins.
   他是一个喜欢收集古币的收藏家。
2. 2.The numismatist specializes in the study of numismatics.
   这位收藏家专门研究钱币学。
3. 3.She has collected thousands of coins from around the world.
   她从世界各地收集了成千上万的硬币。