ped- 是child的意思 pediatrics 小儿科 pediatrician 儿科医生
pediatrics 与pedophilia说明ped后面可以通过 i 也可以是 o 与词缀连接起来
podiatry 足疗 podiatrist 足病医生
psychiatry 精神病学 精神病治疗法
-iatry a combining form occuring in compound words that have the general sense "healing, medical practice," with the initial element(起始部分，如podiatry 中的pod 与 psychiatry 中的psych) usually denoting the area treated