Why is the grass green and the sky blue?

为什么草是绿的，而天是蓝的？

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youdao

Before silos were invented, cows gave less milk during winter because they had no green grass to eat.

筒仓发明之前，因为没有青草可以吃，奶牛在冬天产奶量减少。

《柯林斯英汉双解大词典》

Grass-green ones, as well as Porches and Ferraris in eye-catching colors speeding around highways and streets.

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He finished fifth in his one grass-green tournament this spring, and aspires to a college golf scholarship, which several sand-greens players from the area have earned.

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And in a first for the programme, Ms Suu Kyi picked a record - Green, Green Grass Of Home by Tom Jones - that she had never heard before, because her personal assistant had recommended it.

BBC: Aung San Suu Kyi tells of fondness for Burma army