为测验这些“祖母军”的重要性，井吴博士和其同事引入了一种以蚜虫为食的瓢虫幼虫。

To test the importance of these militant matrons, Dr Keigo and his colleagues introduced predatory ladybug larvae to the plants.

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但格罗夫博士说因为人类体重增加的一个重要原因就是零食，因此他需要猴子们任何时候都能独自呆着，这样它们才会在两餐之间吃些零食。

But Dr.Grove said he needed the animals separated at all times so they could snack between meals, since that is an important reason people gain weight.

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马特森博士说：“从进化的角度来看，很明显我们的祖先是吃不到每日三餐外加零食的。”

"From an evolutionary perspective, it's pretty clear that our ancestors did not eat three meals a day plus snacks," Dr. Mattson said.

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