The ice began to melt as Earth's orbit shifted once more 随着地球轨道再次发生变化 冰开始融化
and global temperatures began to rise. 全球温度开始上升
the warm, wet conditions in which they had thrived began to change. 曾令它们兴旺发展的暖湿条件 开始发生变化
first began long, long before the asteroid. 其实在小行星撞击之前很久就开始了
upwellings of magma began to lift the seafloor... 岩浆喷发开始抬高海床
other creatures began to exploit the relationship between flower and insect... 其它生物开始利用 花与昆虫之间的关系
the vast swamps began to disappear. 广阔的沼泽开始消失
plants began to battle for the real estate above, 植物开始争夺向上的空间
...as the climate suddenly began to cool... 气候突然变冷