Sixteen teams are taking part, divided into four groups.

16支队伍参加，它们被分成4组。

《柯林斯英汉双解大词典》

The students were into four groups before doing experiments.

学生们在做实验前分成四组。

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It must have fourteen lines, with three groups of four lines that set up the subject or problem of the poem.

VOA: special.2010.01.06

And I've divided these into two groups, the big three and the more interesting four.

我将其分为两组，三大因素和四个有趣因素。

耶鲁公开课 - 心理学导论课程节选

Wagon trains -- groups of wagons -- rode in four lines across the land when they passed through dangerous country.

VOA: special.2009.03.30

The orchestra is divided into four groups, and their music progresses at different speeds simultaneously.

ECONOMIST: Elliott Carter

Dr Pollick and Dr de Waal studied four groups of apes held in captivity.

ECONOMIST: Evidence that the first words were movements, not sounds

An amino acid consists of a carbon atom with four groups of atoms attached to it.

ECONOMIST: Folding stuff