為甚麼牛吃草時，草是綠色但點解牛是白色的？（請用英文）

Your question: Why a cow is white when it feeds on green grass.
My answer: There is no direct relationship between the color of an animal and the color of the food eaten.

because the cow is white
his or her mum born it
it cannot change it
although it ate mang grass
and the cow love white , it do not want to change it's colour