起源

Our analysis indicates that apocarpy is polyphyletic within the subclass Alismatidae. Two independent origins of apocarpy in Alismatidae are explored in this study.

研究结果表明离生心皮在泽泻亚纲中是多次独立起源的，据初步估计在泽泻亚纲中离生心皮可能有2次独立的起源。

The molecular phylogeny of Alismatidae based on analysis of chloroplast rbcL gene sequence data serves as a framework with which to evaluate character evolution with respect to the derivation of apocarpy in the group.

本文基於rbcL基因序列资料构建了泽泻亚纲的系统发育关系，依据此系统发育关系为框架，讨论了泽泻亚纲不同心皮的起源与演化，尤其是离生心皮的起源与演化。

Arche is the Greek for "origin."

起源 希腊文 Arche 的意思是&起源&。

Therefore all species of Chinese Athyrium Roth had distribution in Asia.

因此，国产蹄盖蕨属全部分布在亚洲，而横断山脉地区是其分布中心和分化中心，但起源地可能在北方，属温带起源。

The coalescent time of East Asian origin of domestic dogs was estimated as 15,000 or 40,000 YBP.

他们在对家犬起源时间进行了估测后认为，家犬东亚起源的时间为15，000或40，000年前。

The cosmogonic history thus patched up between them closely corresponds in main points with that contained in the Hesiodic poem; while its special details, tone, and colouring are the expression of special climatic conditions.

神灵们传授的这些信息合在一起就构成了宇宙起源史。它与希腊诗人赫西俄德作品中所描述的起源史在主要方面基本一致，只是在细节、语气以及修饰方面具有自己的特色。

Genesis space capsule crashes in Utah desert This NASA television image shows the Genesis return capsule on the ground as it landed in Dugway Proving Ground, Utah.

9月8日，由于降落伞出现故障无法打开，美国&起源&号太阳探测飞船的返回舱一头栽进犹他州的沙漠中。&起源&号返回舱的任务是将采集到的太阳离子送回地球。

CASA concerns with origin, distribution and evolution of life in the Universe, such as search for extrasolar planets, origin, structure, and evolution of planetary systems, search for life under extreme conditions, and effects of ionizing radiation on organic and inorganic molecules so on.

该中心主要关注宇宙生命的起源，分布和演化的研究，比如搜索太阳以外行星，行星系统的起源、结构和演化，探索极地条件下的生命，以及离子辐射对有机和无机分子的影响等。

The earliest and reliable Castanopsis fossil records date back at least to Eocene, and subfamily Castaneoideae fossil records found from Paleocene, it is indicated that appearance of Castanopsis is not later than Paleocene . All fossil records of Fagaceae and Castanopsis report from the Northern Hemisphere and their main distribution regions are in the Northern Hemisphere . It can be concluded that the Northern Hemisphere is the center of origin of Fagaceae and Castanopsis . However, owing to the discrepancy between fossil data and results of modern botany research as well as scarcity of fossil data from key area, precise center of origin of Castanopsis cannot be inferred.

栲属在地质历史上有着比现在广泛的分布，最早、最可靠的栲属化石记录发现于始新世地层，栗亚科化石在古新世就有发现，化石记录表明栲属起源的时间不晚于古新世，所有的壳斗科及栲属的化石都发现于北半球，现代分布也主要在北半球，壳斗科及栲属起源于北半球可以确认，由于化石证据与现代植物学的研究结果有较大差异以及关键地区化石证据的不足，具体的起源地尚不能肯定。

In this project,by using the primitive eukaryotic cell Giardia lamblia as materials,the relationship between lamina and nuclear division, and the origin and evolution of lamin family and were studied.

本课题旨在从起源进化的角度出发，以相对简单和原始的真核生物贾弟虫为材料，探讨核纤层在该原始细胞中的成分和基因，及其与核分裂的关系，还有核纤层蛋白家族的起源进化规律。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了