正常情况下，猴子们很乐意用石头换黄瓜片。
Normally, the monkeys were happy enough to exchange pieces of rock for slices of cucumber.
总之，它们可能摄入了两倍于正常体重猴子的热量。
In all, they might consume about twice as many calories as a normal-weight monkey.
现今，37%饮食限制的动物仍然活着，而消耗正常量的卡路里的猴子只有13%。
Today, 37 per cent of the animals on the restricted diet are still alive, compared to just 13 per cent of monkeys who ate a normal amount of food.
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