naturalization
noun(British English also naturalisation)
[uncountable]the process of making somebody who was not born in a particular country a citizen of that country 使加入…国籍；使成为某国公民；归化 naturalization papers (= documents that prove a person has been made a citizen of a country) 归化证书。
the process of introducing a plant or an animal to a country where it is not native; the process or a plant or an animal starting to grow or live naturally in a country where it is not native 引进（动植物）；移植 the naturalization of garden plants and wild flowers 园林植物和野花的自然化