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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。
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
The second great era after the Precambrian is called Mesozoic Era which extends from 230 million to 65 million years ago. It is the age of dinosaurs. 前寒武之后第二个大的代是中生代，它从距今2.;3亿年一直延续到距今6500万年，这个时期是恐龙的时代。
The origin of lichens dated back to the Precambrian. 资料表明：地衣的起源可追溯到前寒武纪；
My professor studies flora of the Palaeozoic Era. 我的教授研究古生代的植物群。
Among them the Precambrian and Cenozoic eras are the main metallogenic epoches in the world. 就全球而言，前寒武纪和新生代是金矿的重要成矿期。
The era of the backwoods rube is gone. 落后地区乡巴佬的时代已过去了。
The wind whirled the dead leaves about. 风吹得枯叶在四处回旋。
The wind was whispering in the trees. 一阵风穿过树林沙沙作响。
There are 26 letters in the English alphabet. 英语字母表中有26个字母。
The first three eons, which together lasted nearly 4 billion years, are grouped into a unit called the Precambrian. 第一三永世,一起持续几乎4十亿年,被编组入单位称全寒武纪。

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