Its design has been fine-tuned over millions of years. 它的设计经过了数百万年的精心调整
Millions of years before the age of dinosaurs... 在恐龙时代之前数百万年
It's a hunting technique that has been honed over millions of years. 这是一种经过数百万年 得以完善的捕猎技巧
It first evolved hundreds of millions of years ago, 最早在数亿年前进化
like their pioneering relatives millions of years ago. 数百万年前它们富有探索精神的亲戚们 也是这样做的
Volcanoes had been erupting for millions of years. 火山已经喷发了数百万年
ruled the seas for many millions of years. 统治海洋数百万年
virtually unchanged for hundreds of millions of years. 数亿年来几乎没有改变
Millions of n.g.o.'s prove that solidarity between peoples... 上百万的公益组织已经证明人们团结一致