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1·These animals were not as sensitive to climate changes in the Cretaceous period as they are today.

这些动物在白垩纪对气候变化不像今天这样敏感。

2·Changes in climate before the Cretaceous period caused severe fluctuation in sea level, resulting in the extinction of the dinosaurs.

白垩纪以前的气候变化导致了海平面的剧烈波动，引发了恐龙的灭绝。

3·Not exactly outer space then, or the Cretaceous period.

而并不是外太空或是白垩纪。

4·The Cretaceous Period was about 120 million years ago.

白垩纪时代大约是一千二百万年以前。

5·From the view of stratigraphy, they all belong to the Cretaceous period.

从地层学上看，它们都属于白垩纪。

6·From the view of strati graphy they all belong to the cretaceous period.

从地层学上看，它们都属于白垩纪。

7·Xixia ruins belong to the Cretaceous period dinosaur rift sedimentary basin.

西峡恐龙遗址属于白垩纪断陷盆地沉积。

8·In Australia, this happened about 60 million years ago in the Cretaceous Period.

在澳洲，约60万多年前发生在白垩纪。

9·The prehistoric reptile lived in the cretaceous period about125million years ago.

这只史前爬行动物生活在约一亿两千五百万年前的白垩纪。

10·The prehistoric reptile lived in the Cretaceous period, about 125 million years ago.

这只史前爬行动物生活在约一亿两千五百万年前的白垩纪。