查询词典 caecilians

Phylogenetic analysis suggests that the batrachian divergence occurred in the Middle Permian, rather than the late Carboniferous as recently estimated using molecular clocks18, 22, but the divergence with caecilians corresponds to the deep split between temnospondyls and lepospondyls, which is congruent with the molecular estimates.

谱系分析认为蛙形两栖类的分歧应发生于二叠纪中期，而不是石炭纪末。然而，与离片椎类和壳椎类这一意义深远的分歧密切相关的事件——蛙形两栖类与无足目的分歧的时间却与分子钟所估计的相符。

Frogs and toads, salamanders and newts, wormlike (and little-known) caecilians—these are the class Amphibia: cold-blooded, creeping, hopping, burrowing creatures of fairy tale, biblical plague, proverb, and witchcraft.

的蚓螈，这些都属于两栖动物纲，牠们冷血、爬行、跳跃，是童话故事里的洞穴生物、圣经里的灾祸，常见于俗谚与巫术里。

Except one lungless species -''Typhlonectes eiselti'', only known from one specimen collected somewhere in South America - all Caecilians have

除了在南非发现的''Typhlonectes eiselti''没有肺之外，所有无足目的生物都有肺，但是他们同时也使用皮肤与口进行氧气的吸收。

Most caecilians live underground in damp places.

大部分蚓螈生活在潮湿的地底下。

Caecilians are found in most of the tropic areas of South-East Asia, Africa and South America, except the dry areas and the high mountains.

蚓螈分布在除了干旱地区和高原外的绝大部分的东南亚、非洲和南美的热带地区。

For central Africa no systematic search has been done yet, but it is likely Caecilians are found all over the tropical rainforest there.

中非的系统探寻蚓螈的工作还未展开，但是在那里的热带雨林中找到蚓螈的可能性非常大。

Caecilians' feet have degenerated, making the smaller species resemble worms, while the larger species with lengths up to 1.5 m resemble snakes.

无足目的动物的脚已经退化，造成其中较小的种类看起来像蠕虫，而比较大的种类（长度可到1.5公尺）则看起来像蛇。

The class of vertebrates that live on land but breed in water; frogs; toads; newts; salamanders; caecilians

a。两栖类的，水陆两用的n。两栖动物，水陆两用飞机，水陆两用车

Caecilians' feet have degenerated, making the smaller species resemble worms, while the larger species with lengths up to 1.5 m resemble snakes.

無足目的動物的腳已經退化，造成其中較小的種類看起來像蠕蟲，而比較大的種類（長度可到1.5公尺）則看起來像蛇。

The male Caecilians have a

雄性蚓螈具有类似

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。