“在国外留学” 常见的英文短语有以下几种表达：
study abroad
例句 ：I plan to study abroad to expand my horizons.（我计划去国外留学以拓宽我的视野。）
study in a foreign country
例句 ：She is studying in a foreign country and experiencing different cultures.（她正在国外留学，体验着不同的文化。）
pursue one's studies overseas
例句 ：He decided to pursue his studies overseas to gain more advanced knowledge.（他决定去海外留学以获取更先进的知识。）