(每日一词）certify

Certify  /ˈsɝː.t̬ə.faɪ/ v. （通常以书面形式）证明，证实; 正式证明…患有精神病

meaning: to say in formal or official way, usually in writing, that something is true or correct. 

meaning: to say officially that someone is mentally ill 

1) 词根：cert- 确定(certain)

2) 后缀：-ify 动词后缀（classify) 

e.g. The meat has been certified as fit for human consumption. 已证实该肉品适合人食用

e.g. As a young man, he had been certified and sent to a hospital for the mentally ill. 他年轻时被证明患有精神病，并被送到了精神病院。