numismatist n. 钱币学家，钱币收藏家
scientist n.(自然)科学家
例句：
A nurse anesthetist unearthed a nest.
一名护理麻醉师掘出一套器具。
She was unconscious after being injected by the anesthetist.
麻醉师给她注射了一针后，她就失去知觉了。
She has great potential as an artist.
她很有潜质，是一位可造就的艺术家。
Whoever made this cake is a real artist.
制作这个蛋糕的人真是个艺术大师。
The artist has caught her smile perfectly.
艺术家惟妙惟肖地画出了她的微笑。
He keeps putting off going to the dentist.
他把看牙医的事一拖再拖。
She made periodical visits to her dentist.
她定期去看牙医。
You should visit your dentist at least twice a year.
你应该每年至少去看两次牙科医生。