The Colour of the Sky

• 作 者: Alfred Russel Wallace
• 出 处: 英语学习（教师版）
• 发表日期: 2004年期

1rnIf we look at the sky on a perfectly fine summer\'s day we shall find that the blue colour is the most pure and intense overhead, and when looking high up in a direction opposite to the sun. Near the horizon it is always less bright, while in the region immediately around the sun it is more or less yellow.