查询词典 natural selection

Dr Gaulin thinks an evolutionary fight is going on between natural selection, which conserves metabolic expenditure and promotes longevity, and sexual selection, which willingly trades both for extra mating opportunities.

Gaulin博士认为自然选择的目标和性选择的目标在进化中互相冲突，自然选择倾向于保存自己，降低代谢强度，让自己活得更长；而性选择的目标是为了得到更多的交配机会，不惜以代谢强度和长寿为代价。

Because muscles come at such cost, Dr Gaulin thinks an evolutionary fight is going on between natural selection, which conserves metabolic expenditure and promotes longevity, and sexual selection, which willingly trades both for extra mating opportunities.

肌肉的存在要付出相当代价， Gaulin博士认为自然选择的目标和性选择的目标在进化中互相冲突，自然选择倾向于保存自己，降低代谢强度，让自己活得更长；而性选择的目标是为了得到更多的交配机会，不惜以代谢强度和长寿为代价。

Maize inbreds are xenial. For the hybridization along with continuous gene exchange among different plants creating a new hereditary variation pool and thereafter on the effect of natural selection and artificial selection, it creates a new germ plasm which is different from the original germ plasm at quite a large extent.

玉米是异花授粉的，在不同植株之间，由于杂交以及相伴随的连续的基因互换会创造出新的遗传变异库，其后在自然选择和人工选择的作用下，产生在相当程度上不同于原始亲本种质的新种质。

A it is predominantly derived from the initial variety or from a variety which itself was predominantly derived from the initial variety, while retaining the expression of essential characteristics that result from the genotype or combination of genotypes of the initial variety; an essentially derived variety may have been obtained by the selection of a natural or induced mutant or of a somaclonal variant, by the selection of a variant individual from plants of the initial variety, by backcrossing, by a transformation by genetic engineering, or by any other similar method

一个品种主要由原始品种演化而来，或主要由原始品种的实质性派生品种演化而来，同时保留了来自原始品种基因型或基因型组合的基本特征的表达；一个实质性派生品种可能通过选择自然变异或诱变或体细胞无性变异、原始品种植株的个体变异的选择、回交、基因工程的改造或任何其它类似方法而获得。

Sand hair goat breeding has a long history, is a long-term specific local ecological environment, natural selection and artificial selection under the influence of the formation of the joint. In l951, as local sand wool fur products on display in Beijing, has aroused attention of the relevant experts and scholars and, through investigation and research in the areas, known as the Zhongwei goat fur. In the early 50 international markets in Europe, some experts have caused surprise and appreciation.

沙毛山羊养殖已有悠久的历史，是长期在当地特定的生态环境中，自然选择和人工选择共同影响下形成的。l951年沙毛裘皮作为地方特产在北京展出时，引起了有关专家学者的注视，并通过在产区调查研究，定名为中卫裘皮山羊。50年代初期在欧洲国际市场出现，也曾引起一些专家的惊奇与赞赏。

Article 15 Where a project of which the total dumping volume of dredged stuff is less than 500,000 steres needs to use a temporary ocean dumping site, the specific demonstration may be carried out by a selection and demarcation technology entity on the basis of collecting the existing natural environmental and social and economic materials of the dumping site and the sea areas around, and a report on selection and demarcation may be directly drawn up by that entity.

第十五条疏浚物倾倒总量在50万立方米以下的工程项目需要使用临时性海洋倾倒区时，可由选划技术单位在收集倾倒区及其附近海域现有自然环境和社会经济资料的基础上开展专题论证，直接编制选划报告。

Herbalife Herbalife products, the source of skin-dimensional characteristics of the The product is world-renowned experts in plant ecology, the international hotspots of biodiversity and communities artificial Association, the Chinese Academy of Sciences, former director of the Kunming Institute of Ecology Professor Feng Yaozong, according to the principles of ecology combination of traditional Chinese medicine theory, the use of modern high-tech means After more than four decades of observation, research, filter selection and repeated clinical trials, the selection of tropical rain forest in Xishuangbanna, Yunnan climate unpolluted virgin forest in the unique natural refined from wild plants.

该产品是由世界著名植物生态学专家、国际热区人工群落与生物多样性协会主席、中国科学院昆明生态研究所原所长冯耀宗教授，根据生态学原理结合传统中医学理论，采用现代高科技手段，经过四十多年的观察、研究、滤选、反复临床试验，精选云南西双版纳热带雨林气候下未受污染的原始森林中特有的天然野生植物精制而成。

I plant in this technologically advanced production lines, a high degree of automation products of good quality, with an annual output of up to 6 tons, relying on natural resource advantages of biotite, muscovite natural selection of high quality raw materials, through the crush, and then by sub - level, dry products obtained.

我厂这条生产线技术先进，自动化程度高，生产的产品质量好，年产量可达6千吨，依托得天独厚的云母资源优势，精选的优质天然白云母为原料，通过粉碎后，再经分级、干燥得到的产品。

1Niche construction can lead to stable coexistence of diverse genotypes in spatially structured population, which supports a stable polymorphism even without heterozygote superiority.(2)With habitat deterioration, niche construction accelerates the formation of steady polymorphism and hence impedes the harmful influences of environment on the population, which might embody a life-history strategy of organism under the unfavorable environment.(3)Niche construction results in the coexistence with alternative polymorphism through genotype-environment feedback and limited gene flow.(4)The niche-constructing organism is an active force to alter its environment and hence the direction of natural selection in order to better survival.(5)Spatial dynamics and distribution pattern of metapopulation are profoundly influenced by time-lagged niche construction.(6)Metapopulation size can reach a fixed level in the recency effect and equal weighting of time lag but is statistical stability in primacy effect, which implies the primacy effect is most remarkable.(7)The increment in the relative weightingof each generation\' niche construction and the length of time lag are significant factors for system destabilization.(8)Moderate capacity of positive niche construction benefits the metapopulation persistence.(9)The narrowing of niche breadth can decrease the metapopulation size and thereby increase the extinction risk.(10)The coupled function of time lag and niche construction make the system oscillation and generate the spiral wave, spiral-broken and circular wave in heterogeneous habitat.The spatial distributions of metapopulation and resource content are complementary due to a phase lag of their both frequencies.(12)Metapopulation persistence with niche construction depends not only on the balance between colonization and extinction, but also on the balance between the ability of niche construction and natural dissipation of habitat.(13)Metapopula-tion can survive under certain condition when the percent of suitable patches in habitat is lower than the ration of extinction to colonization.(14)Two thresholds exist in the process of transition of habitat quality dynamics from unsuitable to suitable, which include the intensity of niche construction and the initial condition of system.(15)Metapopulation size is positive correlated with the ability of positive niche construction, which means that organism or population who has strongly positive influences on their environment plays an important role to maintain the available habitat.

通过上述几个方面的研究，主要得出以下15条结论：(1)生态位构建可使空间结构种群，甚至是在没有杂合子优势的条件下，形成多种可能的稳定基因型分布模式；(2)随着环境的破坏与恶化，种群的生态位构建作用加速其较早形成稳定多态以阻碍环境对种群的不利影响，解释了有机体在不利环境下的一种生活史对策；(3)生态位构建作用通过基因型—环境反馈机制及有限的基因交流导致基因型多态的稳定共存；(4)有机体的生态位构建作用是一种积极的动力改变环境进而改变其自然选择的方向；(5)生态位构建的时滞作用对集合种群动态和空间分布产生深刻影响；(6)集合种群大小在时滞的崭新效应和等权重效应下达到一固定值，而在首位效应下达到统计稳定，表明首位效应的影响最显著；(7)首位效应下生态位构建相对权重的增量和时滞的长度是影响系统不稳定性动态的关键因素；(8)适中的生态位构建强度有利于集合种群的续存；(9)生态位宽度变窄会减少集合种群的数量从而增加其灭绝风险；(10)时滞和生态位构建的双重作用使系统产生周期振荡，并在异质性环境中产生稳定的螺旋波，破碎的螺旋波和环形波三种分布模式；(11)集合种群与资源含量的空间分布因为相滞而互补；(12)具有生态位构建的集合种群续存不仅取决于侵占率与灭绝率之间的平衡，而且依赖于生态位构建能力同其生境的自然消耗速率之间的妥协；(13)当生境中适合侵占的斑块比例小于其侵占率与灭绝率之比时，生态位构建作用促使集合种群在一定条件下续存：(14)生境斑块的状态从不适合到适合转变过程中存在生态位构建强度和系统初始条件这两个阈值；(15)集合种群的大小同正生态位构建能力正相关，意味着对环境具有较强正作用的有机体对维持有效生境起积极作用。

Flashing yellow, peaceful and elegent blue, vigous green……among 09SS collection, H.L especially select white, blue and yellow as the major colors. Besides, it can be seen the lastest international fashion trend from its simple design. With regard to the fabric selection, natural fabrics such as cotton, linen and silk etc. are adopted to embody natural, simple and free style and to express fashion concept. The fabulous matching between fabrics and cutting is used to meet needs for comfortable and casual clothing. Meanwhile, using bright and vivid color can still reflect jauntiness and elegence nature even if the products are finished.

热力四射的黄、宁静优雅的蓝、生机盎然的绿……今年的春夏新款，H.L特别选用以白色、蓝色及黄色为主要流行色，在设计简单的同时又融入国际最新流行风尚，以此体现女性的雅致与灵动。H.L在面料的选用上，以最能体现自然、简约、自由这一风格的天然质感的面料如棉、麻、蚕丝等，从面料中体现服装的内涵，追求面料与剪裁的高度和谐，以迎合都市人舒适、随意的着装需求；同时运用明快鲜艳的色彩，成品后依然保持本真的色调，彰显出活泼与高雅的气质。

I think people in this lifetime in a rebirth.

我觉得人在这一生里其实也在轮回。

He had to tie her hands together.

他不得不把她的双手绑在一起。