petrogram怎么读，petrogram什么意思，petrogram短语和例句

1.When Dawang cliff petrogram, discovered in Malipo County, Yunnan Province, was formed always keeps unknown.

云南省麻栗坡县城以东发现的大王岩画的形成年代一直是个谜。

2.When Dawang cliff petrogram, discovered in Malipo County, Yunnan Province, was formed always keeps unknown.

云南省麻栗坡县城以东发现的大王岩画的形成年代一直是个谜。