例句與造句

1. In Greenland the rock was formed by two consecutive metamorphic overprints of an originally igneous rock.
2. The intrusion took place in the Archean around 2800 million years ago and the metamorphic overprint was dated at 2700 and 2500 million years ago.
3. It's difficult to find metamorphic overprint in a sentence. 用metamorphic overprint造句挺難的