① assure(make sb. feel less worried,make sb. believe)使……放心,使相信。
She assured me that she would try her best to help us. 她讓我們放心,她會盡全力幫助我們的。
They assured us of the soundness of the plan. 他們讓我們放心,那項計劃是可靠的。
I am assured of his success(that he will succeed). 我相信他會成功的。
② ensure(make certain that something happens)保證。
I can not ensure you a good job. 我不能保證你能得到一份好工作。
She came early to ensure getting a good seat. 她來得早,以便確保得到一個好的位子。
Her ability will ensure success to/for her. 她的能力保證她能成功。