- 释义：
- n. 定期迁移；迁居
- 构词：
- migrate迁移,移居+ion动作或状态→migration移民;移往
- 例句：
-
Swallows begin their migration south in autumn.
燕子在秋季开始向南方迁移.
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The migration consisted of three waves of settlers.
向西部移民的运动先后出现过三次浪潮.
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Change of climate must have had a powerful influence on migration.
气候的变化对于迁移必曾有过极大的影响.
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