Why human became naked apes is still a mystery. Explanations range from ease of heat loss to the selection of mates by the quality of their skin. Dr Greaves's study, though, removes any doubt about why a change of skin color was essential.
词汇突破： Homo sapiens 现代人
Apes 猿
range from…to … 包括…和…
though: 两个, ,隔开的though=however
remove ： 1.Why human became naked apes is still a mystery.
为什么人会变成“裸猿”还依旧是个迷。
2. Explanations range from ease of heat loss to the selection of mates by the quality of their skin.
主干：Explanations range from A to B.
A= ease of heat loss
B= the selection of mates by the quality of their skin.
解释包括，易于散热以及可以通过皮肤的质量来选择配偶。
Dr Greaves's study, though, removes any doubt about why a change of skin color was essential.