1、The museum hired a renowned numismatician to authenticate their collection of ancient coins.
博物馆雇佣了一位著名的钱币学家来鉴定他们的古代硬币收藏。
2、As a passionate collector, he joined a numismatician society to learn more about the history and value of coins.
作为一个热衷的收藏家，他加入了一个钱币学家协会来了解更多关于硬币的历史和价值。