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1·A petroglyph emerges from the Sahara Desert.

这是撒哈拉大沙漠里的一块岩石画。

2·Petroglyph is a modelling art, which has its own laws and artistic features.

岩画是造型艺术，岩画的造型有其深在的规律性和艺术特点。

3·Many Russia scholars believe ochre petroglyph were at the same age as slab-stone tombs'.

俄罗斯学者普遍认为赭石岩画与石板墓的年代相当。

4·It resembles a petroglyph of some sort more than it resembles the usual crop circle design.

与其说它像“普通的”麦田怪圈，不如说它有点像某种岩石雕刻。