officially

Although they have lived together for years, they only got officially married last month.

(Chinese) 虽然他们在一起生活了很多年，但直到上个月才正式结婚。

The new school building was officially opened by the mayor during a ribbon-cutting ceremony.

(Chinese) 市长在剪彩仪式上正式宣布新校舍落成启用。