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；
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。
Some of the lining epithelia appear mucinous, but I cannot be sure without high power views.
部分衬复上皮呈粘液性，但因未提供高倍图像，我不能确信。
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。
We cannot be sure if today's transport problems be addressed in the near future -reversing it seems like an optimist gone mad!
我们不能确定今日的交通问题是否明日可解决，本末倒置的作法是作白日梦。
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)。
I doubt it, but we cannot be sure, because there are bound to be fields in other countries ripe for exploitation with the same technology.
对此我虽然持怀疑态度，但也不能妄下结论，因为在其他国家必然有油田已具备采用与美国相同技术的条件。
We cannot be sure whether our dreams will come true, We can at least be hopeful that our efforts to improve the world will be successful.
我们无法确定梦想能否实现，但至少我们对我们改造世界的能力会获得成功充满信心。
Although renewable capacity has been added quickly in some countries, you cannot be sure that the wind will blow or the sun will shine to order.
尽管一些国家的可再生能源产能已在快速增长，但人们却不能确定风和阳光能够按需而至。
Even if managers know that a new product will follow this cycle, they cannot be sure when each phase will start and for how long it will last.
即使管理者们知道一个新产品要经历这个周期，他们也无法确定各个阶段将会于何时开始，以及将要持续多长时间。
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.
我们不难确定我们的梦想能否实现，但至少我们可以希望我们改善世界的努力是会成功的。
If you cannot know whether you are in the real world or in the word of a computer simulation, you cannot be sure that your beliefs about the world are true.
如果你无法知道自己是身处现实世界还是受困于电脑模拟情境，那么你就不能确定自己对于世界的信仰是正确的。
The risks are all the more pronounced in liberalised markets, where power plants cannot be sure that there will be customers for the electricity they generate.
这些问题也困扰过以前的核电项目。在宽松的市场条件下，核电厂的风险更为显著，因为它们不能保证一定有客户购买产出的电力。
I say "perhaps" beyond the next decade because one cannot be sure that leading Asian countries will not shift away from growth-producing policies in the more distant future.
我说也许是未来十多年，是因为没有人可以肯定主要的亚洲国家更远的未来不会从增长产生的政策中转变。
I say "perhaps" beyond the next decade because one cannot be sure that leading Asian countries will not shift away from growth-producing policies in the more distant future.
我说也许是未来十多年，是因为没有人可以肯定主要的亚洲国家更远的未来不会从增长产生的政策中转变。
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