Farmers have learned that they have to migrate if they want to survive.

It was also found that the position of substituting group took effect on migration time.

同时发现,芳香环上取代基位置对迁移时间的影响有一定规律.

...a dam system that kills the fish as they migrate from streams to the ocean.

导致鱼类在从溪流向海洋迁徙途中死亡的水坝体系

Most birds have to fly long distances to migrate.

绝大多数鸟类为了迁徙都不得不进行长距离的飞行。

Hakka culture was formed migration southward from area and gradually blending with aboriginal culture.

客家文化是由中原南迁的汉民族所带的中原文化与土著文化相互交融而产生的.

migratory flights/birds

（候鸟）迁徙；候鸟

Such styles reflect a migratory trend: After working abroad, many here are back money and modernity.

这种衣着风格反映了当地流动性的趋势: 从国外打工回来后, 许多人不只带回了钱,也带回了现代化的气息.

The American Robin ( Turdus migratorius ) a migratory songbird of the thrush family.

美洲知更鸟 ( 旅鸫 ) 是画眉科迁徙鸣鸟.

The part that migratory birds play in spreading the virus is still being studied.

迁徙鸟在病毒传播中的作用还在研究过程中.

Yiyang , the site of the outbreak , lies next to Lake Dongting, which hosts many migratory birds.

爆发地 宜阳 临近许多候鸟的聚集地洞庭湖.

The migratory fish are four: the reproductive migration feeding migratory and migratory warming, the winter migration.

鱼的洄游主要有四种: 生殖洄游、索饵洄游、趋暖洄游 、 越冬洄游.

An American migratory songbirdDolichonyx oryzivorus, the male of which has black , white , and yellowish plumage.

长刺歌雀美洲鸣鸟,一种候鸟(长刺歌雀).

Habits: Uncommon Spring migratory bird and winter visitor.

生态习性: 为春秋普遍过境鸟,与稀有冬候鸟.

Migratory birds fly long distances between a winter home and a summer home.

候鸟要在冬巢和夏巢之间飞很远的距离.

Most migratory farm workers earn very little indeed by comparison with other'workers.

大部分移民过来的农业工人的收入与当地人相比确实非常低.

A migratory bird that stops in a particular place for a limited period of time.

侯鸟在一特定的地方停留一段有限时间的一种迁移鸟类.

Little is known about the migratory habits of these huge fish.

对于这些大鱼的洄游习性知之甚少.

The positive rate of migratory birds is higher than birds.

候鸟的阳性率极显著高于留鸟.

The main protection for necked cranes and other migratory birds and their habitat.

主要保护对象为黑颈鹤等候鸟及其栖息环境.

Besides migratory birds, what other animals have the habit of migrating?

除了候鸟, 还有哪种动物有移居的习性?

The mechanism of influence of the magnetic flux density on migratory behavior was discussed.

并对磁场强度影响初晶硅迁移的机制进行了探讨.