annual migration翻译

annual migration的基本解释

读音: 美: 英:

年度迁徙：动物为了寻找食物、繁殖或逃避恶劣气候而每年进行的迁徙。

例句

It was travelling north on its annual migration to the rookeries of Bering Sea.现在正当一年一度向北迁徒到白令海的老窝去的季节。
Besides, Afghan officials now report that the Kuchis have begun to leave anyway, on the next leg of their annual migration.另外，现在阿富汗官员报告说，Kuchi族人也已经开始撤退了，正准备继续他们一年一度的大迁移。
Time just flied. It was getting colder and colder. Finally their annual migration time came. One early morning, all swallows gathered together.随着时间的流逝，天气渐渐冷了起来，终于到了一年一度的燕子南迁的时候了。

短语

annual migration rates 年迁移率
annual rate of net migration 年净迁移率
annual rate of total migration 年总迁移率
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