A dentist called Peabody became the first person to add soap to toothpowder in 1824 and chalk was added in the 1850s by John Harris.
1824年皮博迪医生首次在牙粉中添加皂粉；19世纪50年代约翰·哈里斯在牙粉中添加了白垩。
John: Hello, My name's John Harris.
约翰：你好，我的名字叫约翰·哈里斯。
John Harris, M. D., is a professor of surgery.
约翰·哈里斯，医学博士，一名外科教授。
Communion was celebrated by the Reverend John Harris.
圣餐仪式由约翰·哈里斯牧师主持。
Communion was celebrated by the Reverend John Harris.
圣餐仪式由约翰·哈里斯牧师主持。
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