But Harvard scientists fed two groups of mice either meat or sweet potatoes and prepared the items differently: either whole or pounded, raw or cooked-to create a variety of diets.

但哈佛科学家为了创造使膳食多样化，分别给两组老鼠喂食没切碎的肉和土豆及捣碎的肉和土豆。

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Dear EarthTalk: I don't eat meat, for a variety of ethical and environmental reasons, and I'd rather not feed it to my cat, either.

亲爱的EarthTalk：由于道德和环境等一些原因，我不吃肉，并且我也愿意让我的猫也这样。

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Vitamin B12 is found in a variety of foods, including dairy, eggs, fish and meat.

科学发现维他命B12存在于多种食物，包括奶制品，蛋鱼肉类。

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