转变

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。

The so-called securitification of assets refers to a process in which the original rights and interests holders of non-circulating stocked assets or foreseeable incomes in the future are structured and transformed into marketable and circulating financial products on the capital market.

所谓资产证券化，就是将原始权益人不流通的存量资产或可预见的未来收入构造和转变成为资本市场可销售和流通的金融产品的过程。

The thesis start with the waterborne tourism of the Yangtze River, circumfuse the motif to study.

本文希望通过研究对长江流域的思想解放、观念转变产生积极的促进作用。

It is easy to see that this inhibition and circumscription of the ego is the expression of an exclusive devotion to mourning which leaves nothing over for other purposes or other interests.

每一个主动的努力产生的转变，与死亡的想法没有关系。很容易看到，自我的这种抑制和限制是悲痛特有的表现，它排除了其它的目的或兴趣。

But this is not to say that pan-Asian ethnicity is devoid of culture and sentiment. On the contrary, while panethnic groups may be circumstantially created, they are not circumstantially sustained (see Cornell 1988b). Once established, the panethnic group – through its institutions, leaders, and networks - produces and transforms panethnic culture and consciousness.

即便如此，这并不表示泛亚族裔性这个概念不具有文化意涵和情感，相反的，当泛族裔团体在某些状况下顺势而生时，虽不见得就能从此延续（见Cornell 1988b），但一旦成立，这些泛族裔团体会透过制度、领导者和人脉来衍生与转变泛族裔的文化与意识。

In recent years,thanks to the actions of local government,civil management economy of Chaozhou has a rapid development.

近年来潮州市民营经济得到了较快的发展，这与该市政府转变职能，实施对民营经济的扶持是分不开的。

Cladode A modified internode of the stem that functions as a leaf, being flattened and highly photosynthetic.

叶状枝：经过修饰的茎的节间部，茎转变为叶状，扁平，呈绿色，能进行光合作用。

After that,the pop music finished its history of clandestine activities and stepped into the progress of cultural industry in China.

它的出现意味着一个重大的转变，这就是，剧场演出形式的音乐晚会第一次以电子媒介的方式

With the establishment of the private land ownership, great changes took place in the rural society of the Song Dynasty. Therefore, a series of traits came into being which were most different from those of the previous society, including the weakening of consanguinity, the disintegration of the traditional clannish society, the change of production relations, the development of ethics, and the transformation of governmental functions.

由于土地私有制度的确立，宋代的乡村社会发生了巨大的变化，形成了一系列与前代社会截然不同的特征，这些特征包括血缘关系的淡薄、传统宗族社会的瓦解、生产关系的改变、伦理观念的发展以及政府职能的转变等。

Blomfield could never rival his contemporary Classicist Sir Edwin Lutyens - too many of his buildings are unrefined or lack inspiration - but if you want to capture the essence of Edwardian architecture then it is to his work that you must turn.

Blomfield从来没有竞争对手，当代古典主席埃德温Lutyens说-太多的建筑物的粗浅或缺乏灵感-但如果你想捕捉爱德华七世时代的建筑的本质则是他的工作，你必须转变。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。