化石的

Based on the fossil embryos from the Weng'an biota, present study aims at answering questions about the origin of animals in aspect of embryological and developmental biology.

本文主要从演化发育生物学和胚胎生物学的角度，以瓮安生物群中的胚胎化石为研究对象，探索动物起源和进化中的一些科学问题。

The area also contains fossil sites which provide evidence of the evolution of life on New Guinea, a high level of endemism and the highest level of biodiversity in the region.

这里还保存着化石遗址，记载了新几内亚生命的进化。这一地区拥有动植物的地方特色及高度的生物差异性。

Endothermy must have evolved sometime between the early Late Triassic, when dinosaurs first appeared in the fossil record and the evolution of modern birds whose ancestors first appeared in the early Late Jurassic.

endothermy必须有一段时间演变之间的晚三叠世早期，当恐龙首次出现在化石记录和演化的现代鸟类的祖先最早出现在早期晚侏罗世。

The Eocene's oceans, according to fossil records of oxygen, were the warmest of the past 60 million years.

化石中的氧表明，始新世的海洋是过去6000万年间最温暖的。

However, there are not only a lot of sporo-pollen assemblages from Eocene to Oligocene but also much more ichthyolite from Oligocene to Miocene.

然而，这套地层中存在大量始新世－渐新世的孢粉组合，同时赋存有相当数量的时代为渐新世－中新世的鱼化石。

In today's cartoon we see the fossil skeleton of the GM that soon may be: a dead dinosaur's fleshless frame with a huge uneconomical SUV for a head.

在今天的漫画中，我们看到了有可能很快成为现实的"通用"的化石骨骼。

We have extracted DNA from the inclusion of a dinosaur egg fossil from the Late Cretaceous in Xixia Henan,China, DNA fragments are isolated from the floccus in the cavity of the egg fossil,and confirmed by the method of random primer isotope labelling.

本文从河南省西峡晚白垩世的一枚保存方式特殊的恐龙蛋化石中提取DNA，经过￣32P同位素标记和电泳分析，发现在蛋内腔的絮状物样品中确有DNA片段存在。

The upper layer, with homogeneous composition, is mainly composed of intact phosphatic foraminifer fossils and nannofossils as well as abiotic carbonate fluorapatites, representing the biologic and autogenic origin. However, the lower layer, with visible metasomatic texture and relatively high Si, Al, K and Fe, is notably different from the upper one, and seems to have been formed mainly by replacement of carbonates.

上层磷酸盐由大量形态结构清楚的磷酸质有孔虫和超微化石以及非生物碳氟磷灰石组成，成分均一，杂质少，表现出生物成因和原生白沉积特点；下层磷酸盐变化复杂，具有特征的交代结构，混杂较高的Si、Al、K、Fe成分，显示以磷酸盐交代碳酸盐成因为主。

Furthermore,because the interior and exterior characters of fora-miniferal apertures are becoming more and more important in the classification of foraminifera,we should pay more attention to the free specimen s from Paleozoic foraminiferal stu.

另外由于口孔的内部和外部特征在分类学中的地位越来越重要，所以通过实体化石来研究古生代有孔虫理应受到更多的重视。

The Forest Service estimates that up to one-fourth of the forests it supervises have dangerous levels of fuel.

据森林管理局估计，大约四分之一的森林化石燃料的含量都处于危险的水平。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。