正位

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。

Frontal chest film reveals the heart and lungs to be normal, but there is something missing – the clavicles.

在胸部正位片上心影与肺影均正常，但是不要漏了锁骨。

Methods Acetabular index,CE angle,acetabuar head index and acetabular depth were carefully measured on roentgenograms of 120 developmental dysplasia of the hip cases over 5 years post-operation and 120 normal children whose age were similar to sick children as control group during following-up.

方法对比120例术后5年以上的双髋X光片和随机选择的与随访时年龄相近的120例正常的双髋正位X光片，仔细测量髋臼指数、CE角、臼头指数和髋臼深度，对单侧者还进行双侧对比测量。

Parker's ratio decreased when the entry angle decreased, lag screw's location trended to the inferior of the femoral head.

随着进钉角度的减小，正位像上的Garden指数从160°增加到172°，Parker比率逐渐减小，拉力螺钉位置趋向于股骨头的下方。

That equals only one out of every hundred expo attendees will be able to visit it.But on the other hand, Taiwan's pavilion has a good spot at the entrance to Zone A beside the Expo Axis.

但另一方面，台湾馆的区位极佳，正位於「A片区」入口处、世博主要干道「世博轴」之旁，意即当正式开展时，熙来攘往的参观人潮百分百必定会经过台湾馆。

That equals only one out of every hundred expo attendees will be able to visit it.But on the other hand, Taiwan's pavilion has a good spot at the entrance to Zone A beside the Expo Axis. That means that all expo attendees will have to pass by it.

但另一方面，台湾馆的区位极佳，正位於「A片区」入口处、世博主要干道「世博轴」之旁，意即当正式开展时，熙来攘往的参观人潮百分百必定会经过台湾馆。

In the experiment focused on decadal changes, GCMs reproduce the observed NAO shifts in recent decades by imposing strengthening trends on stratospheric wind. The cooling belt extending from North Africa to subtropical Eurasia is simulated accompanying the strengthening of NAO. East end of this cooling belt reaches the eastern flank of Tibetan Plateau.

在强调年代际变化的实验中，通过在平流层中强迫出水平风场的线性增强趋势，大气环流模式可以模拟出近几十年间冬季NAO指数的年代际上升；伴随着NAO正位相的增强，模式可以再现北非至副热带欧亚大陆的冷却带，且其东端可以到达青藏高原下游地区。

Eventually, you want your feet alignment to be so that a line drawn back from your front heel intersects the middle of the arch of your rear foot.

最后，你要你的脚正位，这样从前面的脚跟贯穿后脚的足弓呈一直线。

A section of blade in knife can swing, this is to come into contact with the blade rollers without arose as a result interolcking scraping unevenness, so at the last fixed blade that from both sides will squeeze blade only 34, ink tools without leaving gaps in the front end of the blade and rollers contacted fall into line.

不朱刀在不朱刀支架上是可以把握摆动的，这是为了不朱刀在隔绝不朱辊时不会因爆发不正位而变成刮不朱不匀，因此在末了变动不朱刀时一定要从双方不兵34只不朱刀挤不松，不朱刀间不不去间隙，使不朱刀前端在与不朱辊隔绝处排成曲线。

The hostel is on a cliff facing the Rhine!!! You can see the whole city of Koblenz.

这个hostel正位於莱因河畔的悬崖上，还可以鸟瞰整座Koblenz 城！

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。