正式进入

例句：

1. 1. The team officially entered the competition last week.
   上周，该队正式参加了比赛。
2. 2. The new member officially joined the company yesterday.
   昨天，新成员正式加入了公司。
3. 3. The school officially opened its new campus this spring.
   今年春天，学校正式开放了新校区。