形容詞是migrated ，migrate做及物動詞時(shí)有偏移，移居，移植的意思 ，所以它的過去分詞形式也可以理解為形容詞 放在句首

舉個(gè)例子，migrated line. 偏移測線，migrated depth section 偏移深度剖面 migrate是動詞，譯為遷移，移居。它的形容詞兩個(gè): 1. immigrant 移來的,移民的

migrate的形容詞是migratory，migratory中文意思是adj. 遷移的；流浪的

Early in his research, Kramer found that caged migratory birds became very restless at about the time they would normally have begun migration in the wild.在克雷默早期的研究中，他發(fā)現(xiàn)被關(guān)在籠中的候鳥在它們通常開始在遷徙的大致時(shí)間會變得非常不安。