Have you seen any murals? 你见过壁画么？

　　A mural is a picture painted on a wall or ceiling. 壁画是绘在墙壁上或天花板上的图案。

　　Do you know the famous work of Michelangelo, The Creation of Adam? 你知道米开朗基罗的著名作品《创造亚当》吗？

　　It is a mural, because it is painted on the ceiling of a chapel. 它就是壁画，因为它画在小教堂的天花板上。

　　Long, long ago, people lived in caves. 很久、很久以前，人们生活在洞穴里。

　　They sometimes drew pictures on the walls of caves. 他们有时会在洞穴的墙壁上画画。

　　Those drawings were the earliest murals in history. 那些画是历史上最早的壁画。

　　Art historians are very interested in murals, because murals are the earliest form of art. 艺术历史学家对壁画非常感兴趣，因为壁画是最早的艺术形式。

　　In addition, murals and prehistoric time help us understand our ancestors. 此外，壁画和史前时期有助于我们了解我们的祖先。