persist

If the symptoms persist for more than three days, you should consult a professional doctor.

(Chinese) 如果症状持续超过三天，你应该咨询专业医生。

Why do you persist in blaming yourself for an accident that was clearly not your fault?

(Chinese) 你为什么非要坚持为一场显然不是你的错的事故而责怪自己呢？