The sky is blue.和The skies are blue.哪句话没有语法错误?

问题描述:

The sky is blue.和The skies are blue.哪句话没有语法错误?
通常用那哪句?

天空,地球,太阳,月亮等特有的东西不用复数,且前面要加the
eg. the sky
the earth
the sun
themoon
So the first sentense is right.