It may be that some have them already, but we cannot be sure.
也许有些人已经拿到了，但我们不能确定。
He almost certainly attended the Grammar School in the town, but of this we cannot be sure.
几乎可以肯定，他是在镇上念的文法学校，但对此我们没有绝对把握。
Granting that he did say so, we cannot be sure what he really meant.
假定他那样说了，那也不一定是他的本意。
We cannot be sure whether our dreams will come true.
我们不能确定我们的梦想是否将成真。
We cannot be sure if our ancestors were from Persia or Arabia.
我们不能准确地知道，我们的祖先是来自波斯或阿拉伯；
We cannot be sure that this will work as well in humans, but this is the point of performing clinical trials.
我们并不能肯定这在人类中也行得通，而这关键就是进行临床试验。
We cannot be sure whether our dreams will come true, but we can at lease be hopeful that our efforts to improve the world will be successful.
我们不能肯定我们的梦想是否成真，但我们至少对我们改善世界的努力的成功满怀希望。
We cannot be sure whether our dreams will come true, but we can at least be hopeful that our efforts to improve the world will be successful.
我们不能确定我们的梦想能否实现，但至少能够希望我们改善世界的努力会成功。
We cannot be sure whether our dreams will come true, but we can at least be hopeful that our efforts to improve the world will be successful.
我们不能确定我们的梦想能否实现，但至少能够希望我们改善世界的努力会成功。
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