如果正常回答的话：When the sun light irradiation to the surface of the sea,the sea like a transparent three prism.The light from the sun is divided into red,orange,yellow,green,cyan,blue,purple seven colors.The colorful light of different wavelengths,water absorption and scattering in different degrees.Red,orange,yellow wavelength long into the water,strong penetrating power,easily absorb water molecules,increase the temperature of the sea.Blue and green light part,relatively short,penetration is poor,prone to scattering.In the deep sea,red orange light are absorbed by the seawater off,which makes the water appears blue.当太阳光照射到海面时,大海像个透明的三棱镜.太阳光被分成红、橙、黄、绿、青、蓝、紫七种颜色.这七色光线的波长不同,被海水吸收和散射的程度也不同.红、橙、黄的波长比较长,射入水中穿透力强,容易被水分子吸收,使海水的温度提高.蓝光和一部分绿光,光波比较短,穿透力差,容易发生散射.在深海里红橙光大都被海水吸收掉了,这就使海水呈现出蓝色了.如果是脑筋急转变的话：Because the fish.Why has the fish is blue?Because the fish spit bubble!Why do fish spit bubbles is blue?Because when the fish spit bubbles have the sound of "Blue Blue Blue..."因为有鱼.为什么有鱼就是蓝色的呢?因为鱼会吐泡泡!为什么鱼吐泡泡就是蓝色的呢?因为鱼吐泡泡的时候有声音“Blue Blue Blue.“
