使显著

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。

Methodssmear 0.25% croton oil＼acetone ag on the back of kunming mice,and observe the growth condition of papilloma,then record the quantity of tumor-bearing mice and the quantity of tumor in each mice.results20-ginsenoside rh2 prolonged the incubation of tumor, reduced the quantity of tumor-bearing mice and decreased the amount of tumor in each mice.conclusion20ginsenoside rh2 has obvious anti-papilloma effect on the mice skin.

结果20-人参皂苷rh2对小鼠皮肤乳头状瘤有明显的抑制作用，可使肿瘤发生潜伏期延长，使化学致癌物诱发的荷瘤动物数明显减少，每鼠荷瘤数显著下降。结论20r 人参皂苷rh2在预防癌症的发生和发展方面有重要的作用，也是很有前景的新型抗癌药。

This article utilizes the literature material law, the questionnaire survey procedure, the teaching cut-and-try method carries on the analysis to the middle school sports teaching, discovered the question includes: As a result of the birth control policy implementation, in the Wei County two middle-school students the only child increases day by day, the child becomes in the family the treasure, the elder dotes on has Canada, in addition the social life level unceasing enhancement, the child nutrition surplus situation remarkable increase, a student physique front year obviously drops, therefore the middle school physical education becomes everybody attention gradually the focal point, how very good physical education, how does cause the student to like on the physical education, how finally causes the physical education to become the student to grow the growth important curriculum, namely the physical education plays truly imparts knowledge and educates people in the school should get up nurtures the human, nurtures the body the vital role.

本文运用文献资料法，问卷调查法，教学实验法对中学体育教学进行剖析，发现的问题有：由于计划生育政策的实施，威县二中学生中独生子女的日益增多，孩子成为家中之宝，长辈宠爱有加，再加上社会生活水平的不断提高，孩子营养过剩的情况显著增加，学生体质较前些年明显下降，因此中学体育课逐渐成为大家关注的焦点，怎样上好体育课，怎么样使学生喜欢上体育课，最后怎样使体育课成为学生生长发育的重要课程，即体育课真正起到在学校教书育人中所应起到的育人、育身的重要作用。

This article utilizes the literature material law the questionnaire survey procedure the teaching cut-and-try method carries on the analysis to the middle school sports teaching discovered the question includes: As a result of the birth control policy implementation in the Wei County two middle-school students the only child increases day by day the child becomes in the family the treasure the elder dotes on has Canada in addition the social life level unceasing enhancement the child nutrition surplus situation remarkable increase a student physique front year obviously drops therefore the middle school physical education becomes everybody attention gradually the focal point how very good physical education how does cause the student to like on the physical education how finally causes the physical education to become the student to grow the growth important curriculum namely the physical education plays truly imparts knowledge and educates people in the school should get up nurtures the human nurtures the body the vital role.

中文摘要本文运用文献资料法，问卷调查法，教学实验法对中学体育教学停止剖析，发现的问题有：由于计划生育政策的实施，威县二中学生中独生子女的日益增多，孩子成为家中之宝，长辈宠爱有加，再加上社。。。本文运用文献资料法，问卷调查法，教学实验法对中学体育教学停止剖析，发现的问题有：由于计划生育政策的实施，威县二中学生中独生子女的日益增多，孩子成为家中之宝，长辈宠爱有加，再加上社会生活水平的不断提高，孩子营养过剩的情况显著增加，学生体质较前些年明显下降，因此中学体育课逐渐成为大家关注的焦点，怎样上好体育课，怎么样使学生喜欢上体育课，最后怎样使体育课成为学生生长发育的重要课程，即体育课真正起到在学校教书育人中所应起到的育人、育身的重要作用。

Our test showed that defoliation to theextent of 1/4 was most effective.

对夏播苦瓜采取摘叶处理是一种有效的植株调整方式，我们的试验结果表明株洲长白苦瓜摘叶1/4是最有效的方法，使植株的雌花数和♀/♂比值都显著提高，单株实收果数和总果量也都提高；但摘叶过多，如摘叶1/3和1/2，反而使雌花数减少，产量下降。

Nd and Y showed more evident effects than Gd and La due to lower temperature of eutectic reaction with aluminum. In order to investigate mechanism of the formation of the intercellular dispersoid which is being in debate and possibility of suppressing the dispersoid, a nucleation kinetic model which including unsteady nucleation and effect of alloy element was established.

Al-Fe-Mo-Si-Zr-Ti合金粉末具有四种凝固组织，初生Al〓〓，α-Al与Al〓共晶，胞晶及显微胞晶，合金元素Mo的加入，显著提高合金粉末凝固前的过冷度，使10~40μm粉末的凝固机制发生了变化，由导热控制型转变成溶质扩散控制型，从而基本上消除了该尺寸范围内粉末凝固组织中共晶成分和初生相，但对大于40μm的粉末，因共晶区富Zr核心的优先形成而使Mo的作用效果不明显。

Results: Peng's multifunction operative dissector and Curettage and aspiration technique could clear the surgical field, simplify the difficult operation, shorten the operation time, reduce bleeding and injury in the operation, improve the cure rate and the resectable rate.

结果：彭氏多功能手术解剖器及刮吸解剖法使手术视野清晰，使复杂的手术简单化，手术时间显著缩短，减少了术中出血及损伤，提高了手术切除率和根治率。

The mode of the friction saw cutting has been founded and the theory of that one has been put forward according to analysing the process of friction saw cutting, which make use of friction and extrusion to increase temperature of the area of work cutting and make the hardness and strength of work reduce obviously.

通过对摩擦锯切过程的分析，建立摩擦锯切模型，提出了摩擦锯切的原理，主要是利用挤压变形和摩擦，提高工件切削区的温度，使工件的强度和硬度显著下降，同时，设法保持刀具的温度在300℃以下，使硬度保持不变，从而实现了刀具硬度与工件硬度比的大量增加，完成超高速切削。

To attain the same strength grade, the content of cement in cement fly-ash stabilized hoggin has reduced by 0.5~1% comparing with cement stabilized hoggin. This material has a capability of adapting with different aggregate's gradation and the 4.75mm passing rate can reduce to 30%. Through the studying about the mechanical property of cement fly-ash stabilized hoggin, this manuscript discover that the material has good strength growing performance that its 90d strength growing rate is 385% and its splitting strength that the 7d splitting strength is 0.347MPa and the 90d splitting strength is 0.700MPa accord with requirement in the norm.

粉煤灰处于最佳掺量时，通过粉煤灰的填充、活性等作用，使材料在达到相同强度等级，水泥剂量降低0.5～1%；并且对集料级配具有更好的适应性能且能使集料4.75mm以下通过率降低至30%左右；而且能有效提高材料的强度增长率，90d强度增长率高达385%左右；同时，降低回弹模量16%左右，对材料的抗裂性能有显著的改善作用。

Analysis of experimentation results shows that the organic antipollution coating RTV, which has a good hydrophobia and hydrophobia transfer property, can improve the power devices＇ surface resistance and withstanding flashovers performance greatly.

对比试验分析表明，有机防污涂料良好的憎水性和憎水迁移性，使受涂设备的外绝缘电阻及耐闪能力都得到了显著提高，其长效性、良好的适应性以及经济性使其在众多的防污闪措施中具有一定的优势。

The reasons of iron ions content overproof in grade Ⅱ desalting water system,such as variation water quality,contamination of regenerant , operation adjustment of pretreatment system and switching operation of bed were discussed.

对二级脱盐水系统中铁离子含量超标的原因，如来水水质发生波动、再生剂受到污染、预处理系统操作调整、床体运行切换等进行了论述。

You were hired to drum up new business, so go and do it.

公司雇你招徕新业务，你就做你的事好了。