This normal weight animal like this has its whole equilibrium thrown off, its homeostasis thrown off when its dietary conditions change.

在饮食条件发生变化时,这些正常体重动物的生理平衡被打破,于是摈弃了原来的平衡饮食

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

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

Then, a drops out and you weigh your normal self.

此时就没有 a 了,你又感觉体重正常

耶鲁公开课 - 基础物理课程节选

Some people can fight the brain off in this case, and control their food intake, maintain a healthy diet, and maintain a normal weight, but the number of such people in the population is shrinking by the day.

有些人可以抵制大脑的控制,控制食物的摄入量,维持健康饮食 保持正常体重,而今,这类人的数量日益减少

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选