An accent is very hard to shake and it's not just an accent.

口音很难改掉,而且问题还不止是口音

耶鲁公开课 - 心理学导论课程节选

It's a really disgusting habit and you have to stop doing this. It's so impolite.

这真是个令人作呕的习惯。你一定要改掉。这样太没礼貌了。

have to 实战 - SpeakingMax英语口语达人