脊椎动物

The vertebrate TSHβ protein sequences had been used to construct Neighbor-joining and Maximum parsimony phylogenetic tree. As analyzed, Andrias davidianus derived from amphibia firstly, which could reflect its original evolutionary status.

采用邻接法和最大简约法对部分脊椎动物TSHβ氨基酸序列构建分子系统树，结果显示有尾目大鲵为两栖动物中较早分化的一支，表明其进化地位较原始。

A cold - blooded,smooth - skinned vertebrate of the class Amphibia,such as a frog or salamander,that characteristically hatch es as an aquatic larva with gills.

两栖动物一种两栖纲的皮肤光滑的冷血脊椎动物，如蛙或蝾螈，此类动物的特征是有鳃的幼虫在水中孵化，然后逐渐转变成用肺呼吸的成虫

When the first edition of this work was published, I was so completely deceived, as were many others, by such expressions as "the continuous operation of creative power," that I included Professor Owen with other palaeontologists as being firmly convinced of the immutability of species; but it appears ("Anat. of Vertebrates," vol. iii. p. 796) that this was on my part a preposterous error.

当本书第一版刊行时，我和其他许多人士一样，完全被&创造力的连续作用&所蒙蔽，以致我把欧文教授同其他坚定相信物种不变的古生物学者们放在一起，但后来发现这是我的十分荒谬的误解（《脊椎动物的解剖》［Anat.of Vertebrates］，第三卷，796页）。

Ominant groups of Arthropods were Araneida, Diptera, Homoptera and Hymenoptera.

共有节肢动物2纲15目77科326种；土壤动物6门11纲27目，陆生脊椎动物4纲23目54科126属195种。

Any of the class Aves of warm-blooded, egg-laying, feathered vertebrates with forelimbs modified to form wings.

鸟，禽：一种鸟纲温血、卵生、有羽毛的脊椎动物，前肢演变形成翅膀

"Bird: any of the class aves of warm-blooded, egg-laying, feathered vertebrates with forelimbs modified to form wings."

鸟，禽：一种鸟纲温血、卵生、有羽毛的脊椎动物，前肢演变形成翅膀。

To use a heavy, bladed cutting implement in order to chop or fell.

透明的刀形穴居海洋小动物；脊椎动物的远古前身。

Then, under the control of systemic factors, mesenchymal cells aggregate and differentiate to form catilage blastemal elements that prefigure skeletal limb components.

脊椎动物胚胎期骨与关节系统的发生是一种复杂生命现象，起始于中胚层间充质细胞的定向聚集，形成肢芽，然后在一系列作用因子的调控下，肢芽内细胞进一步分化，形成具有骨骼雏形的软骨原基，后者经软骨内骨化发育成骨。

The only other vertebrates known to subsist solely on blood are certain types of candiru, a poorly studied but much feared group of 2-centimeter catfish found in the Amazon and Orinoco Rivers.

另外唯一只以血液维生闻名的脊椎动物是特定种类的寄生鲶，一种很少人研究，但很多人害怕的2公分鲶鱼，在亚马逊河和奥利诺科河被人发现。

A member of the Crossopterygii, a group of bony fishes with paired, rounded fins that are extinct except for the coelacanths and are regarded as ancestors of amphibians and other terrestrial vertebrates.

总鳍鱼一种总鳍目鱼，长有成对的圆形鳍，除了空鳍鱼类的鱼之外现已全部灭绝，被认为是两栖纲动物和其它陆生脊椎动物的祖先

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。