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。

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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。

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This attaches methyl groups (a carbon atom and three hydrogens) to either adenine or cytosine, two of the four chemical bases that form the alphabet of DNA, depending on the gene involved.

腺嘌呤和胞嘧啶是DNA四大成分其中之二，而到底附着于哪一个则取决于具体的基因。

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Form two groups of four.

组成两个四人的小组。

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

在群居方面，已知15个种群中只有4个种群形成延续超过一年以上的群体。

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

在群居方面，已知15个种群中只有4个种群形成延续超过一年以上的群体。

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