查询词典 evolution

However, the evolution of the amniote heart is poorly understood.

本期封面所示为乌龟和蜥蜴心脏的三维图像。

The result showed that newwheat species might be prodcued in progeny of unstable amphidiploid, which offeredsignificant pattern for evolution from octaploid wheat to hexaploid wheat and widenedthe train of thought of studying the origin of biological species.

这个结果显示，通过对双二倍体分离后代的有效选择，有可能形成一个新的小麦种，从而为从八倍体小麦向六倍体小麦演化提供了一个新的进化模式，拓宽了研究物种起源的思路。

Studies on gene structure, function and expression in amphioxus will contribute to the understanding of the origin and evolution of the vertebrates.

利用分子生物学手段，研究文昌鱼有关基因的结构、进化和表达，可以从分子水平上来揭示包括人类自身在内的脊椎动物的起源。

Amphioxus is expected to be a model laboratory animal in the near future because of its important position in evolution, simplified internal organ systems and transparent body.

文昌鱼特殊的进化地位、简单的器官系统和终生透明的躯体等特征，使其很有希望成为一个新型实验室模式动物。

Amphioxus, a cephalochordate, is believed to be the closest living relative of the vertebrate. It is often regarded as an important model animal for phylogenetic studies on the evolution of animals from invertebrate to vertebrate.

文昌鱼是头索动物，被认为是现存的与脊椎动物最接近的无脊椎动物，经常被看作是分析从无脊椎动物到脊椎动物进化过程的一种重要的模式动物。

ABSTRACT Amphioxus, a cephalochordate, is the closest living relative to vertebrate, and has been widely known as the most important animal to study the origin and evolution of vertebrates.

文昌鱼是介于无脊椎动物和脊椎动物之间的过渡类型，是研究动物进化和胚胎发育的典型材料。

Common wheat ; Wheatgrass ; Amphiploid ; Specific DNA sequences ; RFLP analysis ; Genomic changes ; Polyploid genome evolution

小麦；天蓝冰草；双二倍体；专化DNA序列； RFLP分析；基因组变异；多倍体基因组进化

This first transfer of political power from a ruling party to an opposition party symbolizes a significant change in Taiwan's political evolution.

首次的政党轮替，对於台湾的政治发展而言，是具深远意义的政治变迁。

From taking a look on the law of development of furniture style, the history of furniture has come through an endless evolution in each period,just as the anagenesis of human being.

主要的家具风格有传统风格、乡村的民俗风格、当代\现代家具风格几种类型。

Cook seems to have been the first to coin the term 'speciation' for the splitting of lineages or 'cladogenesis,' as opposed to 'anagenesis' or 'phyletic evolution' occurring within lineages.

这一术语与发生在世系内的"前进演化"或"种族的进化"这些提法相抵触。

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。