1. 非正式地:unofficial 非正式的 | unofficially 非正式地 | unopened 未开放的
2. 非正式的:distances 距离(复数形式) | unofficially 非正式的 | road signs 路标(复数形式)
3. 非公认地:unofficialinformality 非正式 | unofficially 非公认地 | unoiled 未涂油的
4. 非正式地/非公认地:unofficial /非正式的/非官方/非正式/ | unofficially /非正式地/非公认地/ | unoiled /未涂油的/
adv
1. not in an official capacity
e.g. unofficially, he serves as the treasurer
2. without official authorization
e.g. he had made some money on the side
Synonym: on the side