例句與造句

1. The presence of silver ore in unchanged, horizontal limestone and marl of the Cretaceous formation would be without precedent . . . it is not improbable that the changed Transition rocks, containing quartz, which appear about forty miles downstream near the mouth of the San Saba, as well as the granite rocks which appear particularly between the Bowie ( con su tropa ), 1829; Moore, 1840.
2. It's difficult to find transition rock in a sentence. 用transition rock造句挺難的