这些鸟夏季移栖到欧洲，冬季回到南方温暖的地方。
These birds migrate to Europe in the summer season, returning to warmer places in the south for the winter.
有些鸟会在冬天移栖到较温暖的地方。
这些鸟在春天移栖北方，秋天移栖南方。
These birds migrate northwards in spring and southwards in fall.
这些鸟春天移栖到北方，秋天移栖到南方。
These birds migrate northward in spring and southward in fall.
绿头鸭又叫做野鸭，是一种会依季节移栖的候鸟，冬天时飞向温暖的南方，夏天时再飞回北方的繁殖地进行繁殖。
The mallards are migratory birds sometimes called wild ducks. They fly to the warm South in winter, then return to the North in summer for breeding.
绿头鸭又叫做野鸭，是一种会依季节移栖的候鸟，冬天时飞向温暖的南方，夏天时再飞回北方的繁殖地进行繁殖。
The mallards are migratory birds sometimes called wild ducks. They fly to the warm South in winter, then return to the North in summer for breeding.
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