formation

n. /fɔːrˈmeɪʃn/ B2

形成；形成物

The process of developing, producing, or organizing something.

仙境例句

The Tortoise said the formation of a pearl takes years, so the lesson was very long.

老陆龟说一颗珍珠的形成要好多年，所以这堂课特别长。