原生代的

Neural crest cells are a transient population of multipotent progenitors that give rise to numerous cell types in the embryo.

神经嵴细胞是一个暂时性的原生代细胞，在胚胎可发生很多类型的细胞。

A multinational team headed by researchers at Yale has identified a tortoise which has half his genes in common with George and is "clearly a first generation hybrid between the native tortoises from the islands of Isabela and Pinta."

耶鲁大学研究员领导的跨国团队已经发现有只陆龟与乔治的一半基因相同，「显然是伊莎贝拉岛与平塔岛原生陆龟的第一代混种」。

There is abundant evidence of flourishing colonies of cyanobacteria and other bacteria through Archaean and Proterozoic eons.

大量的证据证明繁盛的蓝细菌和其他一些细菌贯穿太古代和原生代。

One example: the discovery of massive ice ages in the Proterozoic, following the great reduction of CO2 in the atmosphere.

一个例子是：在原生代发现大规模的冰川期，随后出现大气中二氧化碳剧减。

What is now clear is that the evolution of eukaryote cells is either caused by or at least profoundly influenced by, symbiosis with bacterial and archaean cells at some stage in the Proterozoic.

现在清楚的是，在原生代的某些阶段细菌细胞和太古细胞的共生，造成了真核细胞的进化，或对真核细胞的进化产生了深刻的影响。

The substitution of oxygen for carbon dioxide in the atmosphere, which occurred in the Proterozoic, caused probably by cyanobacteria in the form of stromatolites, caused changes leading to the evolution of aerobic organisms.

发生在原生代的大气中氧气取代二氧化碳，可能是由藻青菌在叠层结构上造成的；大气改变引发的变化，导致了好氧生物的发展进化。

Precambrian time is now divided into three eons: Hadean, from the earth ' s origin to about 3900 Ma; Archaean, 3900-2390Ma; and Proterozoic, 2390-570 Ma (the Cambrian marks the start of the Phanerozoic eon, which extends to the present day).

现在将前寒武纪分为三个时代；冥古代，从地球诞生到约39亿年前；太古代，39亿年前—23.9亿年前，以及原生代，23.9亿年前—5.7亿年前（寒武纪标志显生代的开始，延续至今）。

The model showed that a partial pressure of only 2.9 millibars of CO2 would have been needed during the late Archaean and early Proterozoic periods in order to bring the surface temperature of the Earth above freezing.

模拟显示：在太古代末期和原生代初期，要想使地球表面温度升高到凝点以上，只需要二氧化碳的局部压力达到2.9毫巴。

Millibars of CO2 would have been needed during the late Archaean and early Proterozoic periods in order to bring the su rface temperature of the Earth above freezing.

模拟显示：在太古代末期和原生代初期，要想使地球表面温度升高到凝点以上，只需要二氧化碳的局部压力达到2。 9毫巴。

Of, belonging to, or being the later of two divisions of Precambrian time, during which sponges, sea worms, and other forms of sea life appeared.

原生代的，元古代的前寒武纪两个时期中的后一个时期的，属于这个时期的，在这个时期的在这个时期海绵、海洋蠕虫和其它形式的海洋生命出现

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。