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Khanka wetland is the biggest passage in northeast Asia for bird migration. 兴凯湖湿地是东北亚最大的候鸟迁徙通道,也是迄今为止中国惟一的一个国际性自然保护区。
The story of bird migration is the story of promise - a promise to return. 鸟的迁徙是一个关于承诺的故事，关于回归的承诺。
The possibility of bird-caused crash increases in a pivot airport which is along a bird migration route. 位于鸟类迁徙路线上的枢纽性机场,发生鸟击的机率大大增加。
Our data show that H5N1 influenza virus, has continued to spread from its established source in southern China to other regions through transport of poultry and bird migration. 我们的数据显示，H5N1流感病毒已经持续的从它在中国南方的发源地通过家禽和鸟类迁徙向其他地域进行传播。
Large numbers of birds migrate south every winter. 每年冬季大量的鸟类迁徙南方。
In winter many of our birds migrate form here to warmer countries. 我们有许多鸟儿冬天从这里迁移到比较温暖的国家去。
This kind of migratory bird migrates whenever autumn comes. 这种旅鸟每到秋天都要进行迁徙。
Some birds migrate to warmer countries in winter. 有些鸟会在冬天移栖到较温暖的地方。
Many birds migrate southward every winter. 许多鸟类每年冬季都移栖南方。
Some birds migrate to find warmer weather. 有些鸟迁徙以寻找更温暖的气候。
Some birds migrate as season changes. 有些鸟随季节迁徙。
But I think the secret that the migratory bird migrates is perhaps distributed the wetland on the earth. 但我觉得候鸟迁徙的奥秘也许是因为地球上分布着湿地。
Many birds migrate south every winter. 每年冬天许多鸟向南移栖。
These birds migrate to North Africa in winter. 这些鸟冬天迁徙到北非.
Many birds migrate south for the winter. 冬天时，许多鸟类迁徙南方。
ID micro-chipping injection technique is an important means to study birds migration, breeding biology and conservation management. 微芯片注射技术是研究鸟类迁徙及获取繁殖生物学的重要手段。
The penguin is a flightless bird. 企鹅是一种不会飞的鸟。
The bird sang high and clearly in the tree. 鸟儿在树上清脆地高歌。
The bird flapped its wings and flew away. 那鸟振翅飞去。
Some birds migrate to warmer countries in (the) winter. 有些鸟会在冬天移栖到较温暖的地方。