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。
It maybe that some have them already, but we cannot be sure.
也许有些人已经拿到了，但我们不能肯定。
至于那个，我也不能肯定。
不过，他们还不能确定。
我不能肯定。
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。
The workers believe it was bin Laden, but cannot be sure.
这些劳工认为那就是本·拉丹，但无法确定。
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；
That is scary, and we cannot be sure about changes in the future.
这是可怕的，因为我们无法确定未来会发生什么变化。
Unfortunately I favor melanin but cannot be sure from the photos.
然而，我不能从这些图片中确信是黑色素。
The researchers point out that there are many things they cannot be sure about.
研究人员指出，有很多事情是他们无法确定的。
I think love takes time. You cannot be sure if it is love after only a few weeks.
我觉得爱情是需要时间的，不能说认识了几周就说是爱情。
But you cannot be sure that the URL will still be valid, five years or ten years from now.
但你不能肯定在五年或十年后这url还是有效的。
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。
You can't say where successful, also cannot be sure when you reach a certain point, be happy.
你无法断言哪里才是是成功的，也无法肯定当自已到达了某一点之后，会不会快乐。
The researchers, from the respected Harvard University in the US, cannot be sure why this is the case.
美国知名学府哈佛大学的研究人员还不能够对此给出一个明确的解释。
Sometimes when the ball is caught the umpire cannot be sure if the ball has touched the edge of the bat.
有的时候球被接到以后裁判不确定球是否碰到了击球板的边缘。
If you are refused a visa, getting married in China could help to get the visa, but you cannot be sure.
如果签证被拒了，可以通过在中国结婚帮助拿到签证，但也不一定。
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。
If consumers and companies cannot be sure that their information is safe, they will err on the side of caution.
如果消费者和企业不能确信他们的信息是否安全，他们宁可安全行事。
The programme's makers cannot be sure, but they suspect it may be the first footage of a snow leopard cub filmed in the wild.
虽然还不能确定，但节目制作人认为这很有可能是首次在野外拍摄到野生幼年雪豹。
Moreover, an attacker cannot be sure what effect an assault will have on another country, making their deployment highly risky.
并且，一个攻击者不能够确信一次攻击对另一个国家产生怎样的效果，仅仅是让他的努力具有高威胁而已。
Otherwise the asynchronous nature of agents would mean that you cannot be sure if the function sent has been applied to it.
否则，agents的异步性将意味着无法确保所发送的函数是否已得到应用。
They may not even realize how much time and money they're wasting, and you cannot be sure that you have all the answers, anyway.
他们甚至没发现他们正在浪费多少时间和金钱，无论如何，您不能确保您得到所有的回答。
We called a line with a test tone and started covering up the phone (note, we cannot be sure this line is toll free, but we risked it).
我们用测试语气拨打了一个号码然后开始覆盖住手机(PS：我们不确定那个电话是免费的，但是我们还是冒险了)。
We called a line with a test tone and started covering up the phone (note, we cannot be sure this line is toll free, but we risked it).
我们用测试语气拨打了一个号码然后开始覆盖住手机(PS：我们不确定那个电话是免费的，但是我们还是冒险了)。
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