学生先分头工作，然后六人一组交流心得。
The students work individually, then pool their ideas in groups of six.
似乎最后一个是后来建造的，而前六组是更古老时代的遗迹。
It seems that the last is a later development while the first six groups show the relics of an older system.
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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