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ADJ A migratory bird, fish, or animal is one that migrates every year. 季节迁徙的 [usu ADJ n]
ADJ Migratory means relating to the migration of people, birds, fish, or animals. (人、鸟、鱼等动物)移居的; 迁徙的; 流动的 [ADJ n]
...migratory farm labour.
...流动的农业劳动力。
Some residents voiced concern that the rice could threaten certain species of rare migratory birds.
一些居民担心这种大米会威胁到某些稀有候鸟的生存。
To test the idea, caged night-migrating birds were placed on the floor of a planetarium during their migratory period.
为了验证这个想法，这些在夜晚迁徙的候鸟被关进笼子里，并且在它们的迁徙期间被放置在一个天文馆的地面上。
He noticed that as they fluttered around in the cage, they often launched themselves in the direction of their normal migratory route.
他注意到，当它们在笼子里到处飞的时候，通常会朝着常规的迁徙路线的方向。
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