“出国留学”的英文表达是 study abroad。这个短语直接对应了到国外进行学习和生活的行为。此外，“Overseas Study”也是一个常用的表达，意思与“study abroad”相同，都指代到海外国家或地区学习和研究的行为。
1. I will study abroad whether my parents agree or not.
2. My dream is to study abroad but it is too expensive.
3. Studying abroad provides a great opportunity to broaden one's horizons.
希望这些信息对你有所帮助。