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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。
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。
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。
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 (the) winter. 有些鸟会在冬天移栖到较温暖的地方。
In winter many of our birds migrate to warmer countries. 我国有好多鸟飞往气候比较温暖的国家去过冬。
Many of these birds migrate to our shores during the summer. 每年夏天有许多这种候鸟移栖到我们国家来。
These birds migrate northwards in spring and southwards in fall. 这些鸟春天向北移栖，秋天向南移栖。
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。
In September these birds migrate 2,000 miles south to a warmer climate. 九月里，这些鸟迁徙2,000英里到达气候温暖的南方。
And other birds migrate over the sea,where there are no landmarks at all. 其他的候鸟越过海洋而海洋上一个路标也没有。
And other birds migrate over the sea, where there are no landmarks at all. 其他的候鸟越过海洋而海洋上一个路标也没有。
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。