英语语法分析

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。

Scientists have linked the mass extinction at the end of the Cretaceous with a meteorite impact on Earth.

科学家将白垩纪末期的大灭绝与地球上的陨石撞击联系起来。

This change in plankton found in marine deposits is what marks the boundary between the Cretaceous and the Tertiary.

海洋沉积物中浮游生物的这种变化标志着白垩纪和第三纪的分界线。