白垩纪的

例句：

1. 1.The Cretaceous period is known for its diverse marine life.
   白垩纪时期以其丰富的海洋生物而闻名。
2. 2. The fossils found in the Cretaceous epoch are crucial for understanding Earth's history.
   在白垩纪时期发现的化石对于理解地球历史至关重要。
3. 3. Many scientists believe that the Cretaceous period was a time of great ecological change.
   许多科学家认为白垩纪是一个生态发生巨大变化的时期。