In the first experiment, they asked two groups of people to put 40 unimportant facts into a computer.

在第一个实验中，他们让两组人把40个不重要的事实输入电脑。

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Scientists conducted an experiment on two groups of rats during pregnancy and lactation.

科学家们利用两组正在怀孕和哺乳期的大鼠进行对比试验。

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In a separate experiment, 140 of the children were divided into two groups.

在单独实验中，140个孩子分为两组。

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One experiment involved two groups of people with fake electrodes attached around their lips and chins.

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