There may be certain times of day when smokers crave their cigarette.
一天中可能有那么几次吸烟者特别想叼上烟。
She would break my biscuits in half to be certain I wouldn't choke.
她会把我的饼干掰成两半，以确保我不会噎着。
What Descartes has done is find at least one thing that he can be certain of.
笛卡尔所做的就是找到了至少一件他能确定的事。
To be certain that Rollie was talented, Mr. Ross ran a bright chimp through the same process and compared the results.
罗斯先生为了确认罗妮的确聪明，他对一只聪明的黑猩猩进行了相同的研究，并比较了研究结果。
The third, and most potent limitation is that it is not possible to be certain that the infant's response was due to the stimulus presented or to a change from no stimulus to a stimulus.
第三也是最有力的限制在于婴儿做出的是面对刺激的反应，还是从受到刺激到没受到刺激的变化，这是无法确认的。
There be certain chemicals in fertilizers used to crop-dust cotton that affect the unborn fetus.
作物粉尘中使用的化肥中有某些化学物质会影响胎儿。
So we can't be certain that these findings apply to other ethnic groups.
因此我们不能肯定，这些发现能不能适用于其他种族的人。
In fact Mr Obama cannot be certain even now of securing any health reform at all.
其实，即使到现在奥巴马对医改法案能否通过也没有十拿九稳的把握。
How long do we have to run an experiment before we can be certain of the results?
我们进行多久测试后才能确定得到的结果？
to be certain the sun will shine, but grab an umbrella on our way out — just in case.
确定阳光会很灿烂，出门还是带把雨伞——只是以防万一。
In the absence of good scientific trials, it is impossible to be certain which is which.
在缺乏良好的科学试验的情况下，是不可能确定哪些有效哪些无效的。
And Uncle Matt said: Well, Lawrence, I for one am out here tonight trying to be certain.
马特叔叔说：呃，劳伦斯，我可是打定了主意，今晚一定要万无一失。
Be certain you have feedback forms, and ask for feedback at the end of your presentations.
需要的是确认你要有回馈表单，并且在每次演说后要求对方写反馈。
Female runners also need to be certain they have adequate levels of iron in their diet, too.
女性跑步者还需要保证食谱中包含足够的铁。
So even if immortality would be bad, there would be certain things you could do that could end it.
所以即使不朽是不好的，你也能做某些事去结束它。
I wanted to be certain of my own wisdom by copying Solomon, who had knowledge of hyssop and of tree.
我希望仿效通晓牛膝草和树木知识的所罗门王，确信自己的智慧。
If an argument is valid, then it it's premises are true we can be certain its conclusion is true.
如果一个论点有效，那么前提为真，我们可以确定它的结论为真。
You want to be certain you pick a book you like, as you'll be spending a lot of time studying it.
您肯定希望挑选一本喜欢的书，因为将要花大量时间学习它。
ONE can't be certain, but it seems as if the latest European market panic may—MAY—have come to an end.
没有人敢确信，不过看起来这次欧洲市场恐慌“可能”要结束了。
"In THIS world nothing can be said to be certain, except death and taxes," mused Benjamin Franklin.
本杰明·富兰克林曾沉思，“在这个世界上，除了死亡和税收，没有什么是确定无疑的”。
And remember you don't need a certain number of friends just a number of friends you can be certain of.
请记住，你不需要一定数量的朋友，只要有一些你可以确定的朋友就够了。
It used aliens in place of actual species to be certain that the participants could not draw on prior knowledge.
它用外星人来取代实际实际物种，是为了确信参与者不能利用先验知识。
I would add we can be certain of God's grace while being graciously uncertain of the future details of our lives.
我要再加上一句，我们可以对神的恩典确信不疑，即使对我们生命中未来的具体情况不确定时，仍能心怀感恩。
There'd be certain activities perhaps, for example putting a gun to your head, that would put an end to your life.
也许会有某些特定的活动，比如用枪指着你的头，会结束你的生命。
Nothing in this world nothing can be said to be certain, except death, taxes, and enterprise software disruption.
当今世界，没有什么东西是确定的，只有死亡、税收，和企业软件的破坏性除外。
Nothing in this world nothing can be said to be certain, except death, taxes, and enterprise software disruption.
当今世界，没有什么东西是确定的，只有死亡、税收，和企业软件的破坏性除外。
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