The length of life depends on various factors. Expectation of life is due to various factors.

人们寿命的长短取决于种种因素。

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Expectation of life is the average Numbers of years that a person is expected to live. The expectancy of life is the prediction of average years a person can live.

估计寿命是预计一个人能活得平均年数。

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I have spent my life misjudging the gap between expectation and reality. I still always end up needing a purple bike to get away.

毕生以来我都在错误的判断期望和现实之间的差异，可最终我还是需要一辆紫色自行车载我逃走。

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As I pointed out this time last year, increasing expectation of life is, in general terms, good news for us as individuals.

BBC: Peter Thompson's speech

He was a police informer, appropriately troubled by the complicated ethics of betraying his friends, a man who lived in the full expectation that these transgressions would cost him his life.

NEWYORKER: The Idiot President

Given advance hype for the movie as extravagant as its violence, I doubt that audience members, whatever their race or age, bought tickets with the expectation of seeing some historically faithful saga of antebellum life, and neither did I.

CNN: Why 'Django Unchained' stirs race debate