It is very rare, for instance, for somebody who has learned English past puberty to speak without an accent.

比如,在青春期后才学习英语的人,很少有讲英语是没有口音的

耶鲁公开课 - 心理学导论课程节选

Like, I'm studying Theoretical Physics at UCL in London, so yeah, doing that and

比如，我在伦敦大学学院学习理论物理，所以这是一个工作，同时，

咖啡香弥漫的地方 - SpeakingMax英语口语达人

They're studying practical things like marble work, and metal work, and copper work, and not just shipbuilding.

他们学习一些实用的东西,比如大理石打磨,金属冶炼和铜器制造,并且不仅仅是造船术

耶鲁公开课 - 欧洲文明课程节选

I mean, just be very active learning any languages. You know, articulation and...

我认为，学习任何语言都要积极地去学，比如发音，等等。

英语为什么这么难呢？ - SpeakingMax英语口语达人