1·To discover whether the Bruce effect is a naturally occurring adaptive strategy, researchers from the University of Michigan observed a wild population of gelada monkeys.
为了调查布鲁斯效应是否是一种自然发生的适应策略，密歇根大学的研究人员对野生狒狒进行了观察。
2·With fangs bared and gums blazing, a male gelada looks tough enough.
一只雄性狒狒露出了尖牙和有力的齿龈，这使它看上去相当的暴戾。