我保證你根本不會覺得疼的.
assure:to tell sb that sth is definitely true or is definitely going to happen, especially when they have doubts about it 使確信;向…保證 ~ sb (of sth)
I know you think I did it deliberately, but I assure you (that) I did not.
我知道你認為我是故意干的,不過我向你保證不是故意的. VN (that)
We were assured that everything possible was being done.
我們確信是在盡一切努力.
She's perfectly safe,I can assure you.
我可以向你保證,她絕對安全.
We assured him of our loyal support.
我們使他確信我們始終不渝的支持.