白垩纪

critical period───关键期；[植]临界期

excess period───超期

grace period───（行动、责任等的）宽限期

refractory period───[生理]不应期

refractory periods───[生理]不应期

cretaceous───adj.白垩纪的；似白垩的；n.白垩纪；白垩系

cretaceously───清白地

critical periods───关键期；[植]临界期

free period───空闲时间；自由周期；空课时间

Corythosaurus lived 80 to 65 million years ago. That time was Cretaceous period.───冠龙生活在6500万~8000万年以前, 这个时候是白垩纪.

One was an isolated feather dating from the Cretaceous period (about 100m years ago) that was found in Brazil.───一个是在巴西发现的白垩纪（约1亿年前）的一根羽毛。

Albertosaurus lived 76 to 74 million years ago. That time was called the late Cretaceous period.───阿尔贝塔龙生活在7400万~7600万年前, 这个时期是白垩纪晚期.

Jurassic System entered oil - generating stage in Late Cretaceous Period, and entered oil - generating peak in Tertiary Period.───侏罗系地层在晚白垩世开始进入生油期,第三纪时进入生油高峰,这时侏罗系地层经受的最高古地温为137℃.

The Cretaceous period ended 65 m years ago with the obliteration of the dinosaurs.───6500万年前白垩纪的结束伴随着恐龙的灭绝.

This clam fossil is from the Cretaceous Period, approximately 100 million years ago.───这个蛤化石来自大约一亿年以前的白垩纪时期.

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.

Deinonychus lived 110 to 100 million years ago. That time was called the Cretaceous period.───恐爪龙生活在1亿~1亿1000万年前, 这个时候叫做白垩纪.

As fossil evidences show, the fossil of taxus were found in the upper Cretaceous period.───根据化石研究表明, 红豆杉科的化石发现于上白垩世.

Not exactly outer space then, or the Cretaceous period.───而并不是外太空或是白垩纪。

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.

The Maiasaura lived 80 to 65 million years ago. That time was called the Cretaceous period.───慈母龙生活在6500万~8000万年前, 这个时候是白垩纪晚期.

Ankylosaurus lived 70 to 65 million years ago. That time was called the late Cretaceous period.───甲龙生活在6500万年~7000万年前, 这个时候是白垩纪晚期.

The web found recently dates to the Cretaceous period . At that time, dinosaurs walked the earth.───最近发现的这张蜘蛛网是白垩纪的, 那时候, 地球上还有恐龙在行走.

They date from the early Cretaceous period, which began around 145 million years ago and ended 65 million years ago.───他们最早生活在白垩纪早期，亦即1亿4千5百万年前到6千5百万年前。

The story takes place 6500 years ago in the Cretaceous period.───故事发生在6500万年前的白垩纪晚期.