That reproduces the conditions that led to the evolution of brown fat -- namely, life-threatening cold in babies and small furry animals that cannot put on clothes to keep themselves warm.

• 这样再造出促使布朗脂肪进化的条件，也就是说，把婴儿和小皮毛动物置于冻死人的寒冷中，而不能给他们衣服来温暖他们。