二十四名八年级的学生助手被分成四组，每组六人。

Twenty four student helpers from Grade 8 were divided into four groups of six.

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四组被测分成更小的小组进行回想测试。

Each of the four groups was divided into smaller groups for the recall test.

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然后他们将参与者分成四组，每组都进行那个不同的培训体系。

They then divided the participants into four groups, each of which went through a different training regimen.

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