Look at the Earth from space. Why does our planet look so blue?

从太空中看向地球。为什么我们的星球看起来如此之蓝？

youdao

And both groups had similarly low levels of cortisol, a stress hormone, which might explain why so many people-young and old alike-call their mothers when feeling blue.

两组孩子都很镇静，表现出了适度的压力感，这可能能拿来解释为什么有那么多人，不管是孩子还是大人在心情低落的时候会给妈妈打电话。

youdao

So far, its analysis has addressed how it lost-by alienating too many blue-collar voters, for example-rather than why.

到目前为止，分析已经表明它怎么落选了，比如远离了太多的蓝领选民，而不是为什么落选了。

youdao

Regular clothing stores don't offer up row upon row of pink, purple and dodgy blue, so why on earth would we want them foisted upon us in the form of exercise outfits?

WSJ: Tina Gaudoin on Style: Will the Runway Ever Meet the Road?

So he has to have a story to explain why red and blue has not merged into a consensual purple.

BBC: Obama challenges Congress in $4tn budget gamble