Another group of mice had their ovaries removed but got young ones later.

另外一组的老鼠先取出卵巢随后又移植年轻的卵巢。

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The researchers fed one group of mice a diet in which 60 percent of calories came from fat.

研究人员用脂肪占60%总热量的食物喂养一组白鼠，全是雄性，从一岁开始。

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Researchers warmed up one group of mice to body temperatures of about 103 degrees Fahrenheit.

研究人员使得一组小鼠的处于103华氏度的环境中。

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Then he set up a group of mice that were allowed to eat only 95% of that amount.

ECONOMIST: Longevity

Dr Baker genetically engineered a group of mice that were already quite unusual.

ECONOMIST: A way to counteract part of the process of growing old

They charted changes in the genetic activity in two groups of ageing mice, one group on a standard diet and the other whose diets have been cut to 76% of the standard diet.

BBC: 'Eating less may prevent Alzheimer's'