It has been frequently assumed, but not proved, that the majority of the migrants in what has come to be called the Great Migration came from rural areas and were motivated by two concurrent factors.
人们常常假设，但没有证据证明，在所谓的“大迁移”中，大多数移民来自农村地区，这是由两个同时发生的因素推动的。
The nation's great migration south and west is slowing, thanks to a housing crisis that is making it hard for many to move.
人口往南方和西方迁移的速度正在减慢，这要感谢房市危机，让很多人的迁移变得艰难。
It is called the Great Migration, and it is widely considered one of the most spectacular assemblies of animal life on the planet.
这叫做“大迁移”。这被广泛看作这个星球上最壮观的动物集结之一。
A crocodile eats a young injured wildebeest during the great migration in the Mara River in Kenya which is infested with crocodiles lying in wait to kill.
角马跨越肯尼亚马拉河进行大迁徙时，河中会有许多鳄鱼出没，伺机而动。图中，一只鳄鱼吃掉了队伍中一只受伤的年幼角马。
The next decennial census in 2020 should tell us whether the influx of African-Americans into the South will be large enough to be considered a third Great Migration.
十年一次的下次人口普查将在2020年进行。届时的普查结果将告诉我们迁移到南方的非裔美国人是否足够构成第三次大迁徙。
By looking at the fossil record from that period of time - before the Red Sea was formed - we can gain a clearer view of which species survived this great migration and which did not.
通过观察这一时期——红海形成之前——的化石记录，我们就能更清楚地知道哪些物种在这次大迁徙中活了下来，哪些没有。
"Old America seemed to be breaking up and moving westward," observed an English visitor in 1817, during the first great wave of migration.
1817年，在第一次移民大潮中，一位英国游客观察到：“古老的美洲似乎正在分裂并向西移动。”
This particular phenomenon usually occurred after acquisition of other companies and when the cost of migration and retraining of development teams was perceived as too great.
这个奇特的现象经常发生在收购其它公司后，以及当代码迁移和重新培训开发团队的费用过高的时候。
It is a popular misconception that the Conestoga wagon played a role in the great westward migration towards territories like Oregon and California during the 19th century.
很多人都有一种误解，认为康内斯托加式宽轮篷车在19世纪向西部俄勒冈和加利福尼亚州等地的移民大潮中扮演了重要的角色。
Third, Heil mentioned that great white shark migration patterns take the sharks down the U.S. East Coast during the summer, putting them closer to populated areas.
第三，海尔提到夏季大白鲨沿着美国东岸洄游，而这海岸正是人们海上活动聚集的地方。
Third, Heil mentioned that great white shark migration patterns take the sharks down the U. s. East Coast during the summer, putting them closer to populated areas.
第三，海尔提到夏季大白鲨沿着美国东岸洄游，而这海岸正是人们海上活动聚集的地方。
Change of ground stress influences pore pressure and oil potential, thus has a great influence upon oil migration accumulation.
地应力变化影响孔隙压力和油势，因而对石油运移和聚集有重要影响。
Eighteen million years ago, a series of remarkable events conspired to creat the Great Barrier Reef — the migration of a continent, the might of an ocean, and the full power of the tropical sun.
一千八百万年前，一系列重大事件一同策划创造了大堡礁—大陆移动，强大的海洋，热带太热的全部力量。
The European eel's migration to the Sargasso Sea to spawn is one of nature's great unsolved mysteries.
欧洲鳗鲡迁移到马尾藻海产卵是大自然未解开的最大的谜团之一。
By the time next year's winter migration begins several summer generations will have lived and died and it will be last year's migrators' great grandchildren that make the trip.
从第二年的冬天繁殖期到来，许多夏天的一代将要出生和死去，并且这也会每年持续产生许多旅行的子孙。
In the great context of urbanization, the mobility and migration of population have exercised great influences on people in their linguistic and psychological development in the host city.
在当前我国城市化进程日益加快的环境下，人口的流动和迁移对人们的语言使用及心理都有着巨大的影响。
In 1980, the author predicted some coming great earthquakes in the world by using the symmetrical migration pattern of earthquake. The prediction consists of 12 principal items and 5 additional items.
1980年，笔者应用地震对称迁移图象预测了全球大地震，其中包括12项主要预测意见和5项补充预测意见。
In wave equation migration using finite element method, a great deal of computer's internal storage and computer time are used because of too many unknowns involved.
在使用有限元法求解波动方程偏移过程中，由于未知量数目巨大，需要花费大量的计算机存储空间和计算时间。
Great white sharks in the wild have a huge range of migration, sometimes traveling 50 miles a day.
野外的大白鲨活范围很大，有时一天可游50英里。
The migration of the population has great effects on the economy and society of Sichuan, even on the whole country.
人口的迁移流动对四川乃至全国的经济、社会产生着重要影响。
The distribution of the unconformity surfaces has three characters of discrepancy, succession, and migration which have great influence on the hydrocarbon distribution and reallocation.
不整合面的分布具有差异性、继承性、迁移性，三性对油气的演化和分配有着影响作用。
The Danjiangkou Water Conservancy Hinge Project was a great exploit in China's history, involving migration of 380,000 local people who used to live where the reservoir is now located.
丹江口水利枢纽工程是新中国水利建设史上的一大壮举，涉及水库淹没区移民38万人。
Definition of oil migration orientation has great importance to further oil exploration.
油气运移方向的确定对油气的进一步勘探具有重要意义。
The existence of neptunian dikes is of great significance in the migration and accumulation of oil and gas, and other diagenetic fluids.
水成岩墙的存在对油气和其它成矿溶液的运移和储集具有重要意义。
Organic inclusion is of great importance to the study of development, migration and origin of oil and gas.
有机包裹体在油气成因、运移和演化研究中具有重要的意义。
Organic inclusion is of great importance to the study of origin and migration of oil and gas.
有机包裹体在油气成因、运移研究中具有重要的意义。
The tectonic stress field is of great importance to the oil and gas migration and accumulation.
构造应力场在油气运聚成藏中具有重要的作用。
The tectonic stress field is of great importance to the oil and gas migration and accumulation.
构造应力场在油气运聚成藏中具有重要的作用。
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