Why is the sky blue 为什么天是蓝的
why the sky is blue
为什么天空是蓝色的
以上为机器翻译结果，长、整句建议使用 人工翻译 。
I know why the sky is blue.
我知道天空为什么是蓝的。
youdao
Why the sky is blue?
天空为什么是蓝的？
God is not an Italy fan, why the sky is blue and the cloud is white?
如果上帝不是意大利球迷，为什么天是蓝和云是白色的？
This refraction eliminates both the red end of the spectrum (red light is not bent enough by the air layer to form part of the second image) and the blue frequencies (which are scattered away: this selective scattering is why the sky is blue).
ECONOMIST: In a flash
" and "Why is the sky blue?
BBC: rainbow
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