名詞 migration:

1. the movement of persons from one country or locality to another
2. a group of people migrating together (especially in some given time period)
3. (chemistry) the nonrandom movement of an atom or radical from one place to another within a molecule
4. the periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding

1. Scientists have studied the migration of fish over long distances.
   科學(xué)家研究過魚類遠(yuǎn)距離回游的現(xiàn)象。
2. A movement from one place to another, as by going by, through, over, or across; transit or migration.
   通過從一處到另一處的移動(dòng)，如經(jīng)過、穿過、越過或橫穿; 轉(zhuǎn)移或遷移
3. There was a huge migration of people into Europe because of the war.
   因?yàn)閼?zhàn)爭，大量的移民涌入歐洲。
4. Seabirds will fly from here to another place for migration every year.
   海鳥每年都要從一個(gè)地方遷徙到另一個(gè)地方。

mi.gra.tion

n.（名詞）
The act or an instance of migrating.
遷移，移居：遷移的行為或?qū)嵗?/br>A group migrating together.
移民群，移棲群，洄游魚群：一起遷移的幾個(gè)群體
Chemistry Physics
【化學(xué)】 【物理學(xué)】
The movement of one atom or more from one position to another within a molecule.
移動(dòng)，徙動(dòng)：在分子內(nèi)一個(gè)或多個(gè)原子由一個(gè)位置移到另一個(gè)位置的運(yùn)動(dòng)
The movement of ions between electrodes during electrolysis.
原子移動(dòng)，電離子移動(dòng)：在電解的過程中離子在電極之間的移動(dòng)

【引伸】
migra.tional
adj.（形容詞）