There are two key predictors of a resilient relationship, experts say: mutual support and a willingness to sacrifice.

专家说一段愉快的感情有两个关键的因子：相互支持，有自我牺牲意愿。

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In any case, the incremental changes are modest after 1600--its pretty clear that key predictors drop out before AD 1600, hence the redness of the residuals, and the notably larger uncertainties farther back...

WSJ: Climate Emails: Science and Candor

Depressive symptoms stand out as particularly strong predictors of youth violence and aggression, and therefore current levels of depression may be a key variable of interest in the prevention of serious aggression in youth.

FORBES: Videogames did not cause the Connecticut shooting