But could an ability to store fat have actually played a crucial role in our evolution?然而储存脂肪的能力真的在我们的进化历程中起到了关键作用吗

play a role:起作用；扮演角色

He was invited to play a role in this TV play.

他被邀请在这个电视剧里扮演一个角色。

According to obesity geneticist Dr Eric Ravussin,our hunter-gatherer ancestors had to live off whatever they could find.根据肥胖遗传学家埃里克·鲁瓦森博士的理论，我们以采集狩猎为生的祖先，必须靠食用他们能找到的东西为生

according to:按照；根据

He ranged the books according to size.

他照大小顺序排列这些书。

live off:依赖 ... 生活

Most of the Asians live off rice.

多数亚洲人以大米为主食。

I live off the money from my first book.

我靠我第一本书赚的钱生活。

humankind has been subjected to was an important natural selective process人类则要经历重要的自然选择过程

be subjected to:受到； 经受

She was subjected to indignity and humiliation.

她受到侮辱和羞辱。

This country was once subjected to foreign rule.

这个国家一度曾受外国统治。