The Cretaceous period ended with a mass extinction event.

白垩纪时期以一次大规模灭绝事件结束。

The ankylosaurus lived during the late Cretaceous period.

甲龙生活在晚白垩纪时期。

The tyrannosaurus lived during the late Cretaceous period.

暴龙生活在白垩纪晚期。

Many fossils from the Cretaceous period have been discovered.

许多白垩纪时期的化石已被发现。

The Cretaceous period was known for the dominance of dinosaurs.

白垩纪时期以恐龙的统治而闻名。

It's the early Cretaceous period.

白垩纪早期。

America during the Cretaceous Period.

白垩纪时期的美洲大陆。

The prehistoric world of the Cretaceous Period.

这里是白垩纪时期的史前世界。

In the Cretaceous Period, dinosaurs rarely die of old age.

在白垩纪，恐龙极少自然死亡。

In the Cretaceous Period, plant eaters faced vicious killers.

在白垩纪，食草动物们不得不面对凶残的杀手。