为什么天涯海角是 the FOUR corners of the earth

为什么天涯海角是 the FOUR corners of the earth the four corners of the sky Four Corners crossroad,intersection和the four corners作十字路口时的区别? friend of the earth the pull of earth the end of the sky and the corners of the sea The ends of the earth. the friends of the earth 时态怎么选1.by the middle of the 1920s the farthest corners of th four is the double of two.为什么double前要加个the There are four oceans on the earth Ocean 为什么要加s