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；
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。
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。
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。
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。
Last come the Twins, who cannot be described because we should be sure to be describing the wrong one.
最后是双胞胎，他们无法被描述，因为我们肯定会描述错一个。
If the messaging topology is such that ordering cannot be guaranteed, then we cannot be 100% sure that all of the other messages in the group have arrived.
如果消息传递拓扑无法保证顺序，则无法无法百分之百地确定组中所有其他消息已经达到。
Although we cannot be entirely sure, the following is probably a fair explanation of what went on.
虽然我们不能完全肯定，但是接下来的可能是比较合理的解释。
The seasonal flu vaccines with adjuvants have mostly been given to older people, so we cannot yet be sure that these vaccines do not have very rare side effects in younger people.
含佐剂的季节性流感疫苗以前主要是给老年人使用，因而我们目前还不清楚它在年轻人身上是否有副作用。
“We cannot yet be sure that there is an irreversible change in the trend, ” he told a parliamentary debate on joblessness on November18th.
“我们尚不能确定不可逆变化会存在于这种趋势中，”他说在11月18日这天，国会还就失业问题进行了辩论。
We'll make sure the packing is seaworthy, but we cannot commit ourself to be responsible for every kind of mishap.
我们可以保证包装适合海运，但不能对每一种损失都负责。
We'll make sure the packing is seaworthy, but we cannot commit ourself to be responsible for every kind of mishap.
我们可以保证包装适合海运，但不能对每一种损失都负责。
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