作为专门研究猿类和猴子的动物学家，我一直在研究人类为什么进化为裸猿，以及为何皮肤在世界范围内以多种不同的肤色出现。
As a zoologist focusing on the studies of apes and monkeys , I 've been studying why humans evolved to become the naked ape , and why skin comes in so many different shades around the world .
裸猿