migrate: 迁移；迁徙; 从一处到另一处 (动词)immigrate: (动词) 移居到某处(是从此地的角度看，向内移进)immigrant: (名词), 移居到某处的人(是从此地的角度看，移进)后二者可以与emigrate, emigrant(移出)比较(词义类似，方向相反)
