They're accidents.

这些只是意外而已
Why do you like chocolate bars, assuming that you do?

为何你喜欢巧克力呢假设你喜欢
It is not because your ancestors in the African savanna

不是因为你非洲草原上喜欢巧克力
who enjoyed chocolate bars reproduced more than those who didn't.

的祖先比那些不喜欢的人后代多
Rather, it is because we've evolved a taste for sweet things.

而是因为我们进化出了一种对甜食的喜好
And we've evolved a taste for sweet things, in part,

这种对甜食的喜好的部分原因
because the sweet things in our natural environment like fruit

在于自然界里的甜食比如水果
were good for us.

对我们是很有好处的
In the modern world we have created things like chocolate,

现代社会里我们创造出了像巧克力这种
which are not so good for us but we eat anyway.

对我们没好处但是我们依然喜欢吃的东西
A lot of the debates--There's a lot of controversy

很多争论心理学领域对于
in psychology over the scope of evolutionary explanations.

用进化论来解释问题是很有争议的