确信，毫无疑问：表示对某事物有确定的信心或把握，没有任何疑问。
... be sick of 对……厌倦 be sure of 肯定，有把握 be tired of 对……厌烦 ...
... be suited t0适合于 be sure of坚信，确信 be sure to(do)一定，必定 ...
... 2. turn out 原来是；结果发现； 3. be sure of 一定的；必定的；无疑的；确保的； 4. pay attention to 关心；注意； ...
England must win this game to be sure of qualifying.
英格兰队必须拿下这场比赛才能确保获得资格。
England must win this game to be sure of qualifying for the World Cup.
英格兰队必须拿下这场比赛才能确保获得世界杯的参赛资格。
A lot of people think that it's better to pay for their education so that they can be sure of getting quality.
很多人认为最好是自己掏钱受教育，为的是能肯定得到高品质的教育。
He could not be sure of their support if he declared that the purpose of the war was to free the slaves.
VOA : special.2009.10.08
So, he started asking himself the question, "What can I be sure of?"
他首先问自己一个问题,"我究竟能够确信什么呢"
心理学导论课程节选 : 耶鲁公开课
But I'm sure you can easily see how these styrofoam balls could, in fact, be a mono layer of gold nuclei.
这个实验怎么工作的,我们先来做些计算，但我相信你们都已经。
化学原理课程节选 : 麻省理工公开课
And she says international students must be sure they know the rules of the college they are attending.
VOA : special.2009.04.23
So,if your employer tells you to cut to the chase, be sure to get to the main point of your story quickly.
VOA : special.2010.07.25
Still, at any given point, Wikipedia visitors can't be sure of what they're getting.
Although now plainly well placed to win the presidency, the Colonel cannot be sure of it.
That means it is possible to be sure of the paternity of a tadpole.