the Cretaceous period 白垩纪 ; 白垩纪时期
Cretaceous Period 白垩纪 ; 生活在白垩纪时期
late Cretaceous Period 白垩纪晚期
Early Cretaceous Period 早白垩世时期
cretaceous period million years ago 白垩纪时期
earlier cretaceous period 早白垩世
cretaceous period basins 白垩纪盆地
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。
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。
The temperature drop during the Cretaceous period would almost certainly have wiped out an 'abundance' of the world's dinosaurs.
曾经称霸地球显赫一时的恐龙，在白垩纪时代的这次温度巨变中，似乎全都灭绝了。
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