使恶化

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。

Combustion process of a ceramic heat insulated compound engine was experimentally studied in a constant-volume combustion bomb and a B1135 type single-cylinder diesel engine.

结果表明，由于陶瓷隅热复合机的压缩终点温度和压力很高，使滞燃期过短，空气粘度高，着火点在喷油嘴孔口附近，初期火焰横贯喷注，使空气与燃油混合条件差，因而仍沿用常规发动机燃烧系统参数时，燃烧过程恶化、燃油消耗率上升。

Diuresis can also increase calcium excretion; the development of hypocalcemia will make signs and symptoms of hypermagnesemia worse.

但是利尿也能使钙排出增加，低钙血症反会使高镁血症的病情恶化。

I think that would only exacerbate a situation where people feel trapped by oppressive work schedules.

我想那样的话只能使情况恶化，使人有受到令人压抑的工作日程限制的感觉。

Policy of come off sentry duty reduced the consumptive demand of state-owend enterprise worker greatly, make place of feebleminded force worker exasperate, make place of high-energy force worker is improved, support spends their policy to close with its ability positive, weakening policy of come off sentry duty to lose the only track of action is the anticipation that increases state-owend enterprise worker income and the uncertainty that reduce income.

下岗政策在很大程度上降低了国企职工的消费需求，并使低能力职工处境恶化，使高能力职工处境改善，他们的政策支持度与其能力正相关，削弱下岗政策负作用的惟一途径是提高国企职工的预期收入和降低收入的不确定性。

It is good to want brandish this Shuang Renjian, make its are helpful for the development of Chinese economy, on one hand, the relative demand that should maintain China is insufficient, the posture that makes relative demand insufficient expands Chinese economy lives as far as possible; of much square field surface on the other hand, want to control the rate that is not worth relative to demand, make its maintain inside moderate range, want exert oneself to overcome its negative effect, beware of its worsen badly.

要挥舞好这把双刃剑，使其有利于中国经济的发展，一方面，要保持中国的相对需求不足，并使相对需求不足的态势扩展到中国经济生活尽可能多的方方面面；另一方面，要控制相对需求不足的程度，使其保持在适度的范围内，并要着力克服其负面效应，提防其严重恶化。

We know that immediate gratification or irritation only pacifies or deteriorates our emotional stimuli short term.

我们知道一时的满足和烦恼只是使我们使情绪得到短暂安慰或恶化。

While some parents attest sleep is good medicine, medical experts advise against sedating a child as it can worsen the breathing conditions caused by a cold or cough.

虽然一些家长声称这对睡眠是相当有效的药物，但医学专家不要用于使孩子镇定入睡，因为它会使由感冒或咳嗽引起的呼吸问题进一步恶化。

It is the rivers and lakes that have bred up people of Wuhan for generations. Unfortunately, urban lakes have fallen into an awkward situation with the rapid development of urbanization and sharp increase of urban population in recently years. The numbers and areas of urban lake have sharply decreased; some urban lakes have deposited; some became swamp. Additionally, soil erosion caused by human factors has shoaled lakes and reduced reservoir capacity. Trade-waste sewage and domestic sewage flow into lakes, which has caused the deterioration of water quality.

然而随着近年来城市开发的力度不断加大，城市人口的快速增长，城市湖泊陷入了十分难堪的地步：湖泊数量锐减；水面面积急剧缩小；湖泊淤积严重，部分湖泊逐渐沼泽化，再加上人为因素造成的水土流失，使湖泊变浅，库容量降低；生产生活污水的大量排放使湖泊水质恶化。

A fuel pump in which fuel injection conditions are not deteriorated by a discharge of vapor to the engine side and that achieves a large fuel suction height and a short fuel suction time.

本发明获得一种燃料泵，其不会使蒸汽向发动机侧喷出而使燃料喷出状态恶化，提高燃料吸起高度，缩短燃料吸起时间。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。