我们轮流交换，因为这样公平。

We take turns because it's fair.

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结果表明，轮流交换型任务比自由提供型任务能产生更多的交互修正；

The study shows that the required exchange tasks seem to generate more interactional modifications than optional exchange tasks.

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得出的结论是：影响分组活动的因素是多方面的，其中以赞成能力交叉分组方法和信息轮流交换型任务的居多。

Finally it concludes that factors influencing group work are various, among which mix-ability grouping method and required information exchange task meet more approval.

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