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

Wagon trains — groups of wagons — rode in four lines across the land when they passed through dangerous country. If attacked, the wagons could quickly form a circle for defense.

马车队(即一群马车)，当他们经过危险区时，他们排成四排向前行进，如果遭受到攻击时，这些马车就会很快地形成一个保护圈进行抵抗。

youdao

Socially, only four of the 15 species are known to form groups that last for more than a year.

ECONOMIST: Some bats live in belfries. Others prefer tents