考古学家通过特殊技术发现了这些羊皮纸上的原始文字痕迹。

Archaeologists discovered traces of original texts on these ___palimpsests using special techniques.

这座古老的教堂墙壁上覆盖着层层壁画，就像一个文化叠层，清晰可见不同时代的艺术风格。

The ancient church walls are like ___palimpsests, with layers of frescoes revealing distinct artistic styles from different eras.