migrations

Birds also have built-in timepieces which send them off on fall and spring migrations.

鸟类也有天生的时间感应器指导它们秋春迁移

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Under modern conditions of communication and transportation, population adjustment is maintained by a ceaseless process of individual migrations.

在现代的交通运输条件下，人口调节是通过个人流动的经常性过程来维持的。

词典精选例句

In history, the Miao nationality experienced frequent wars and migrations, scattered widely and separately in the world. In addition, they had no general characters of their own for a long period of time.

苗族历史上战乱、迁徙不断，分布广而散，并且长期没有自己通用的文字。

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with large reserves of wildland connected by habitat corridors to make migrations possible again.

大量的野生土地储备被栖息地走廊连接起来，使迁徙再次成为可能。

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Migrations of heavily armed Arab cattle-herders into the lusher wetlands of the Dinka at the beginning of each dry season have caused violence for decades.

每年干燥季节一开始全副武装的阿拉伯牧牛人就迁移进入牧草更丰美的丁卡湿地，这导致了几十年的暴力冲突。

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Origins and Migrations of Bouyei People in China& Insights from Y Chromosome and Mitochondrion

中国布依族人的起源及迁移初探&来自Y染色体和线粒体的线索

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They are sexually mature at this age and begin to participate in the breeding migrations.

在这个时候它们性征发育成熟并开始参与繁殖大迁徙.

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Although they are known for their long migrations, grey whales do not normally stray from their regular routes.

虽然大家都知道它们有一个很长的迁移，但是灰鲸还是非正常地偏离了他们的常规路线。

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The need to pass on one's genetic legacy is a great motivator of migrations.

把自己的遗传遗产传承下去的需求激励着大迁徙。

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Researchers in Germany used miniature GPS tags to track the migrations of 70 white storks from different sites across Europe and Asia during the first five months of their lives.

德囯的研究人员用微型GPS标签追踪了70只白鹳，发现它们生命的头五个月在欧洲和亚洲不同的地点迁徙。

六级真题- 2017年 6月 2卷 阅读B

It foundered during the turmoils accompanying the Great Migrations.

它在随着民族大迁徙而出现的混乱中崩溃.

词典精选例句

This old so-called tribal nobility disappeared for the most part during the migrations or soon afterwards.

这种古代的 所谓 部落贵族,大多数在民族大迁徙中或在它以后不久便消灭了.

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Global Changes, Biota Migrations, and Stratigraphic Boundary Discuss the Quaternary Boundary in Athinai Region, Greece

全球变化生物迁移和地层界线&论希腊雅典地区第四系底界

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In Rails applications, schema changes occur through migrations.

在Rails应用程序中，模式的更改是通过迁移发生的。

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" Marathon migrations for some birds are set to become even longer," said Stephen Willis, a professor at Durham University in Britain and the main architect of the study.

达拉谟大学教授同时是这一研究的主要推动者史蒂芬。威利斯说：一些鸟类马拉松式的迁徙开始变得更长。

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mass migrations

大规模的迁移

《牛津高阶英汉双解词典》