There's a great deal of variation in how much life we get.

我们活得多久也有很大的差别。

耶鲁公开课 - 死亡课程节选

The great variation in life expectancy among pensioners has been highlighted in a new study by the actuarial firm Towers Watson.

BBC: Business

This also means that there is a lot of variation among breeds in terms of life expectancy.

BBC: Dog years: How do you calculate a dog's true age?

Despite variation in any given person's life experience, studies have shown that music listeners largely agree with one another when it comes to the emotions presented in a song.

CNN: Music: It's in your head, changing your brain