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Of or relating to the oldest known rocks, those of the Precambrian era, that are predominantly igneous in composition. 太古代的所知的最古的前寒武纪时代岩石，其组成成分主要为火成岩的，或与之相关的
Of,belonging to,or designating the earlier of two divisions of the Precambrian era. 早期前寒武纪（的）前寒武纪的两期中较早的一期的，属于它的或以其命名的
S.Haldane, a pioneering British geneticist, replied: “Fossil rabbits in the Precambrian era. 霍尔丹，英国遗传学的先驱，他回答道：在前寒武纪的兔子化石就是了。
Of, belonging to, or designating the earlier of two divisions of the Precambrian era. 早期前寒武纪（的）前寒武纪的两期中较早的一期的，属于它的或以其命名的
Their results, published in 1996, postulated that bilaterians diverged from more primitive animals deep into the Precambrian era, as much as 1.2 billion years ago. 他们的结果发表于1996年，其中推测，早在12亿年前的前寒武纪，两侧对称动物便已经从较原始的物种分支出来。
The Precambrian Era. 前寒武纪时代
(geology) formed in the later of two divisions of the Precambrian era. （地质学）在前寒武纪后半部分形成的。
(geology) formed in the earlier of two divisions of the Precambrian era. （地质学）在前寒武纪中的前半部分中形成的。
geology) formed in the later of two divisions of the Precambrian era. （地质学）在前寒武纪中的前半部分中形成的。
geology) formed in the earlier of two divisions of the Precambrian era. （地质学）在前寒武纪中的前半部分中形成的。
My professor studies flora of the Palaeozoic Era. 我的教授研究古生代的植物群。
Concorde inaugurateda new era in aeroplane travel. 协和式飞机开创了空中旅行的新纪元。
Some say the computer has ushered in a new era. 有人说电脑引入了一个新时代。
The era of the backwoods rube is gone. 落后地区乡巴佬的时代已过去了。
We are living in the computer era. 我们正生活在计算机时代。
His death marked the end of an era. 他的死标志著一个时代的结束。
It's an era of the miniskirt in the seventies. 七十年代是超短裙时代。
of or relating to the oldest known rocks,those of the Precambrian era,that are predominantly igneous in composition 太古代的，所知的最古的前寒武纪时代岩石，其组成成分主要为火成岩的，或与之相关的
Neo-conservatism prevailed in the Reagan era. 在雷根当政期间,新保守主义盛行。
The invention of the computer marked the beginning of a new era. 计算机的发明标志着一个新时代的开始。