formal

英 /ˈfɔːməl/ 　美 /ˈfɔːrməl/

adj. 正式的；官方的Following established rules or officially recognised procedures.
adj. 庄重的；拘谨的Suitable for serious occasions rather than relaxed situations.
adj. 正规的；系统的Organised and structured, especially within an educational institution.

You need a formal invitation to attend the ceremony.

你需要正式邀请才能出席典礼。

Formal education provides essential knowledge, while practical experience helps students apply what they have learned.

正规教育提供必备知识，而实践经验帮助学生运用所学内容。

搭配

formal agreement 正式协议formal complaint 正式投诉formal education 正规教育formal dress 正装

formal不等于former：前者“正式的”，后者“以前的”。

formally (adv.)、formality (n.)、formalise (v.)、informal (adj.)