这是一部成人影片。

Zhè shì yí bù chéngrén yǐngpiàn.

This is an adult film.

他在过去的一年里正式成人。

Tā zài guòqù de yī nián lǐ zhèngshì chéngrén.

He officially became an adult in the past year.

成人教育对于职业发展很重要。

Chéngrén jiàoyù duìyú zhíyè fāzhǎn hěn zhòngyào.

Adult education is important for career development.