迁徙

At last, for the limition of the swarm model based on minimal circumcircle method, we extend the model to n-dimensional spaces; study the aggregating swarm behavior and flocking behavior; and analysis the stability of system.

本文最后针对基于最小外接圆方法的群集模型的局限性，在前人的研究基础上，采用求解任意维空间点集的凸壳的方法，将该模型推广到n维空间中，对n维空间中群体的聚集以及迁徙行为进行建模和稳定性分析。

Even if you are a city dweller, you can find some place, perhaps a park or a golf course, where you can observe the mysterious migrations of the birds and the changing seasons.

即使你是一个城市居民，你也能够找到某个地方，也许是一个公园或是一个高尔夫球场，在那儿能观察鸟类神奇莫测的迁徙和四季的交替。

These people, perhaps 150m of them, enjoy neither the recent benefits accorded to those who have stayed on the land nor the far greater subsidies enjoyed by their city-born counterparts. In 2004 the World Health Organisation described the launch of the new medical system during such a rapid population shift as "the equivalent of launching a ship with a radically new design at the height of a typhoon". The ship is not weathering well.

这些人大概有1500万，既不能像那些留在农村的农民那样享受到近年来的福利，也享受不到他们城市出生的同胞们所享受的更大的福利。2004年，世界卫生组织描述这个应用于如此庞大的人口迁徙的新医保体系启动时称，好比"一艘与其人口同等规模的航船在一种激进构想的指导下在风口浪尖下水"。

Small cold-water silvery fish; migrate between salt and fresh water.

小的有银色光泽的冷水鱼；在咸水和淡水之间迁徙。

King heaven bird The figure is not the biggest, but natural disposition is distinctive: One of, duteous to love not change, no matter men and women, in one day is in love, lifetime photograph companion, also do not fight, not clamorous also, caring forever each other so, cherishing each other, which day loses a partner, another bird is absolutely won't remarry or marry additionally, however fast in order to die; Secondly, their natural disposition is alone, do not wish and other plant group of commensalism one place, but every time the environment has change, they fly high in the sky, appropriative migrate the person lead a way of the team.

大王天堂鸟身材不是最大，但禀性特异：其一，对爱情忠贞不渝，无论男女，一朝相恋，就终生相伴，也不打架，也不吵闹，就那么永远地互相关心着，互相爱护着，哪一天失去伴侣，另一只鸟绝对不会改嫁或另娶，而是绝食以死；其二，它们生性孤独，不愿和别的种群共栖一处，但是每当环境有变，它们却高高地飞在天上，充当迁徙队伍的引路者。

Researchers have found that migrating animals use a variety of inner compasses to help them navigate.

研究人员已经发现迁徙性动物可以借助各种各样的体内罗盘来校正方向。

To mollusks, can also make use of magnetic compasses. It is of course very

研究人员已经发现迁徙性动物可以借助各种各样的体内罗盘来校正方向。

Faces contorted with pity always ask me how it was to"move"my junior year.

总有一些人带着怜悯的表情问我年少时"迁徙"的滋味如何。

Whooping crane chicks are conditioned to fly with an ultralight aircraft, which servers as their guide during the fall migration to their wintering area in western Florida.

从2003年至2005年计划还要进行3次超轻型飞机引航的美洲鹤人工迁徙。

"Men belonging to Haplogroup R1b are direct descendants of the Cro-Magnon people who, beginning 30,000 years ago, dominated the human expansion into Europe and heralded the demise of the Neanderthal species," Wells said.

威尔斯说："单倍群R1b种族中的男性是克鲁马努人的直系后代。克鲁马努人于3万年前进入欧洲，并主宰了人类向欧洲迁徙的进程，他们的出现标志着尼安德特人种的消亡。"

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。