| 1. | It is usually used to study the evolution of the sequences from a common ancestor , especially biological sequences such as protein sequences or dna sequences
这一方法常用于研究由共同祖先进化而来的序列，特别是如蛋白质序列或dna序列等生物序列。 |
| 2. | Wheeler ' s team used dna sequencing and computer simulations to reconstruct the evolutionary tree of venomous fish ? all the way back to their common ancestor
威勒的团队使用dna排序和计算机模拟的方法重构了有毒鱼类的遗传树,一直追溯到它们的共同祖先 |
| 3. | Last year , the team found a 13m - year - old partial skeleton , also believed to be a common ancestor of apes and humans - a male fruit - eater , nicknamed pau
去年这个队伍发现了1千3百万年前的不完整骨骸，咸信为猿与人的共同祖先，男性以水果维生， ?称包乌。 |
| 4. | Some of these animals have modified or lost their limbs , but their common ancestor had them ? two in front and two in back , where fins once flicked instead
这些动物之中，有的改变了形象或者失去四肢，但?们的共同祖先都具有四肢，两只在前、两只在后，位于原本是鱼鳍拍动的地方。 |
| 5. | The evolutionary tendency or process by which animals or plants that are descended from a common ancestor evolve into different forms when living under different conditions
分歧，相异。指来源于一个共同祖先的动物或植物后裔在不同的生活条件下演变成不同的形式的进化趋势或过程。 |
| 6. | Although we suspect that the gladiators share a common ancestor with the mantids and stick insects , it will take more work to establish their exact position within the evolutionary tree of insect life
虽然我们怀疑螳与螳螂、竹节虫有共同祖先，不过还得要做许多研究，才能确定螳在昆虫演化系谱上的确切位置。 |
| 7. | And the principle has formed in the study of evolution in classifying species from population brought forward a new thought which made the common ancestor of creature and its relation as the classified criterion
种群分类原则是以生物的共同祖先及其相互关系作为物种分类的标准，它是在生物进化研究中形成的。 |
| 8. | A group of organisms having common ancestors and certain distinguishable characteristics , especially a group within a species developed by artificial selection and maintained by controlled propagation
属一群拥有共同祖先和明显特征的有机体，尤指属于同一物种的一群，通过人工选择来发展，通过有控制的繁殖来维持 |
| 9. | The most recent common ancestors between humans and all the other great apes date back to about 15 million years ago , suggesting this common preference has been part of our brain structures since at least then
可证明的人类和猿类拥有共同祖先的最近时间是1500万年前，也就是说至少从那个时候起，人类和猿类就拥有同样的记忆方法。 |
| 10. | This investigation placed the last common ancestor of bilaterian animals at a much younger date , though still older than the cambrian explosion , somewhere between 573 million and 656 million years ago
这项研究把两侧对称动物最后的共同祖先，定置于较晚的时间，不过仍比寒武纪大爆发的时间要早，大约是6亿5600万年至5亿7300万年前之间。 |
