圆口纲脊椎动物

Any of various primitive eellike vertebrates of the class Agnatha,such as a lamprey, lacking jaws and true teeth and having a circular,sucking mouth.

圆口纲脊椎动物一种类似鳗鱼的无颚纲原始脊椎动物，如盲鳗，没有下颚和真正的牙齿，而长着圆形吮吸的嘴

Any of various primitive aquatic vertebrates of the class Cyclostomata,lacking jaws and including the lampreys and hagfishes.

鳗类，鳗无颚的各种原始水生圆口纲脊椎动物中的一种，包括七鳃鳗和盲鳗

Eellike cyclostome having a tongue with horny teeth in a round ''.

似鳗的圆口纲脊椎动物，舌头上有锉牙，圆形''。

A mouth or an opening .primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue.

原始的似鳗的淡水或淡水中产卵的圆口纲脊椎动物，它们有长有吮吸嘴，嘴内有锉舌。

Primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue.

原始的似鳗的淡水或淡水中产卵的圆口纲脊椎动物，它们有长有吮吸嘴，嘴内有锉舌。

Small (2 in) extinct eellike fish with a finned tail and a notochord and having cone-shaped teeth containing cellular bone; late Cambrian to late Triassic; possible predecessor of the cyclostomes.

2英寸大小已经灭绝的长有带鳍尾、脊索和含有细胞质状骨胳的锥形牙齿似鳗的鱼；后寒武纪到后三叠纪的生物；可能是圆口纲脊椎动物的祖先。

Eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms.

缺少下巴或成对附器的似鳗的动物包括圆口纲脊椎动物和某些灭绝的种类。

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。