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There are more of them, researchers don't get as attached to them, and there are some things even a laboratory rat just won't do.

他们数量更多，研究员对他们也不会产生感情，而且他们还能做一些连实验室的老鼠都做不了的事。

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If you want to train a laboratory rat to pull a crank to get a food pellet, the reflex will be scratched in deeper if the creature is rewarded with some regularity but not all the time.

如果你想训练一只实验室老鼠拉曲柄去拿到一粒小丸，并定时给它一些小奖励的话，(但不是每次都一样，)那么这个小东西的条件反射会更强烈。

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This is a normal weight laboratory rat given much more than it would-- could necessarily eat of standard laboratory food.

这是一只体重正常的实验鼠,如果我们给它标准的实验室饲料,即使食物分量超出了它的食量

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The study (PDF) used laboratory rats that were fed either a high-fat or low-fat diet of rat vittles.

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