First get students to form groups of four.

首先让学生分成四人一组。

《牛津词典》

They can form groups of four to join Oxfam Trailwalker.

他们可以四人一组参加乐施毅行活动。

youdao

They can form groups of four to join Oxfam Trailwalker.

他们可以四人一组参加乐施毅行活动。

youdao