查询词典 immigrants

The program to legalised illegal immigrants is an open secret.

非法移民合法化的方案是一个公开的秘密。

To make a comprehensive view of metapopulation researches, we folly analyze and summarize the present concepts, theories and models of metapopulation in this paper, which primarily includes the dynamical models and simulation approaches of single and competitive metapopulations. Based on the Levin's patch occupant model, the center framework of metapopulation researches, primary principles and mechanisms are discussed. First, Levins rule: the fraction of empty patch will remain constant with habitat destruction as long as metapopulation survives. This rule implies that empty patches have determinant effects on persistence and conservation. Second. Allee effect of metapopulation is incurred by establishing difficulties and dispersal costs, which is important to the studies of reserve area and the minimum available metapopulation size. Third, we analyze the rescue effect that immigrants can reduce the extinction risk of the presented local population. Rescue effect can leads to the improvement of metapopulation sustainability and the decrease of fraction of empty patches. Fourth, the coexistence mechanism of two competing metapopulation is discussed, which suggests that competition-colonization trade off may be prevalent in competing systems. Finally, extinction debt ob tamed from coexistence mechanism is given, which depicts the lost of species richness in the future for the current habitat destruction. After theoretical discussion, we present two popular simulated approaches in metapopulations: probability transition model and stochastic process model.

为了能总观集合种群进展的全局并开展进一步的工作，首先对集合种群的已有概念、理论和模型做了全面的分析和总结；其次对集合种群的发展和概念进行了探讨，以集合种群模型的中心框架：Levins的斑块占据模型为基础，展开对其它原理、效应和机制的探讨；主要包括了Levins原理，即当生境进到破坏时，空斑块比例在集合种群灭绝前保持不变，然后还分析了Allee效应（集合种群的Allee效应主要是由于建群困难和扩散损失造成的）；第三，分析了援救效应：迁人个体可以降低斑块中现有局域种群的灭绝风险，援救效应会增强集合种群的生存力，使空斑块比例下降第四，探讨了两竞争集合种群的共存机制，即竞争－侵占妥协，其共存机制为空间生境中物种共存提供了有力的理论解释。

Mr Kotkin predicts a resurgence of the heartland, as Americans move away from the coasts in search of more room. The same forces will attract immigrants to places that have traditionally been lily-white.

Kotkin先生针对美国人离开沿海搜寻家园的现象，预言将会出现&内陆复兴&的盛况；人口增长的力量也会吸引移民们将家安置在传统的白人区。

Mr Kotkin predicts a resurgence of the heartland, as Americans move away from the coasts in search of more room. The same forces will attract immigrants to places that have traditionally been lily-white.

科特金先生针对美国人离开沿海搜寻家园的现象，预言将会出现&内陆复兴&的盛况；人口增长的力量同样也会吸引移民们将家安置在传统的白人区。

Mr Kotkin predicts a resurgence of the heartland, as Americans move away from the coasts in search of more room. The same forces will attract immigrants to places that have traditionally been lily-white.

Kotkin先生针对美国人离开沿海搜寻家园的现象，预言将会出现&内陆复兴&的盛况；人口增长的力量同样也会吸引移民们将家安置在传统的白人区。

Indeed, recent immigrants to the United States are more patriotic toward their new home than long-settled Britons toward the United Kingdom, French toward France, or Germans toward Germany.

相对于久居英国的布列吞人、久居法国的法兰克人、和久居德国的日耳曼人而言，美国的这些新移民对自己的新家园更具爱国之心。

As an estate that is mainly composed of foreign immigrants, metics is the important carrier to unscramble the Athenian polis.

古典时代规模庞大的外邦人①的存在，是雅典城邦在古希腊历史上具有代表性的独特历史现象。

Between 1878 and 1884, some 15,000 Donggans emigrated from the Ili and Kashi regions of China's Xinjiang into the Seven-river region of the Mid-asian Russia, the main body of these Chinese immigrants being the remaining force of the anti-Qing Hui uprising army between 1862 and 1877 in northwestern China.

公元1878-1884年间，从中国新疆伊犁和喀什地区向俄国中亚七河地区迁去了1.5万东干人，其主体是1862-1877年西北反清回民起义军的余部。

The immigrants who had been coming across the Pacific from China since the mid-nineteenth century presented a new problem.

从19世纪中叶起，经太平洋从中国来的移民引起了新的问题。

With hundreds of thousands of immigrants protesting in the streets and a group of self-proclaimed vigilantes called the Minutemen rushing to defend the Southern border, the political stakes were high for Democrats, Republicans, and the President.

无数的移民在街上进行抗议，一群自称见义勇为者，号召&民兵&涌往南部边境进行防卫，民主党人、共和党人还有总统的政治主张风险很高。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。