但我怎样才能肯定到地该不该？
你什么时候会确信？
您肯定的事情是什么？
你怎么能把握得住呢？
你怎么能确定呢？
Really? When will you know for sure?
真的吗？你什么时候能肯定？
You haven't seen it. How do you know for sure?
你还没有见过，你怎么能肯定呢？
Do you know for sure that I love you more than anything?
你相信我爱你胜过一切吗？
Preemptive strikes are okay when you know for sure what you're preempting.
当你确信你所占的先机，先发制人未尝不可。
Do you know for sure that there aren't any memory leaks in your running services?
你能肯定的知道正在运行的服务里面没有内存泄露吗？
If you know for sure that you don't know, then you can start educating yourself.
如果你确信你不知道，那么你就应该开始自我教育。
Once you've got a potential candidate, how will you know for sure they can do the job?
一旦你已经有了一个潜在的候选人，您将如何确切知道他可以做好工作呢？
Don't buy your textbooks until you know for sure the teacher is actually going to use them.
不要买教科书，除非你确信你的导师会用到它们。
If you fail this test then you know for sure that you are not gradient field so you might as well do that.
如果通不过检验，那么可以肯定，它不是梯度场，你可能也会那样做。
These are the beginnings, yes; but how do you know for sure when you don't know the end, and how do you know, or even surmise, the end?
这是开始，没错；但当你还没有看到结果如何的时候，你怎么能确切地知道，即使是猜测到，结果呢？
One really tough teacher can ruin your semester. 2. Don’t buy your textbooks until you know for sure the teacher is actually going to use them.
不要买教科书，除非你确信你的导师会用到它们。
If you know you're going to be out late, make sure you've got enough money for a taxi to get home again or arrange to stay with friends for the night.
如果你知道你会很晚才回家，确保你有足够的钱打车回家或者和朋友一起过夜。
Do you remember all years when scientists argued that smoking would kill us but the doubters insisted that we didn't know for sure?
还记得那些年吗？当初，科学家提出吸烟会导致死亡，而怀疑者们却坚持认为我们还不能确认这一点。
One day, the cat's-meat-man said to him, "Why don't you stop being a doctor for people and become a doctor for animals instead? I'm sure that you know a lot about animals-more than most vets. You wrote a wonderful book about cats. I'd send all the people with sick dogs or cats to you."
一天，卖供猫食用的肉的商贩对他说：“你为什么不停止为人类看病，转而为动物看病呢？我相信你对动物的了解比大多数兽医还要多。你写了一本关于猫的好书。我会把所有带着生病的猫狗的人都送到你这里来。”
The ICONS are in the source code for this article (see Resources), but I'm sure you know a graphics expert who can draw better ones!
图标在本文的源代码中给出(请参阅参考资料)，但是我敢肯定您认识有比这画得更好的图形专家！
So fear not - you already have and know enough - new skills will come for sure as you progress on your journey.
所以不要担心你已经拥有或知道的不够多——新的技术在你的旅程中自然会到来的。
You know, but that doesn't kind of change my life, for sure not.
你知道，但是这不会改变我的生活，确定不会。
But ask your doctor if this is the best drug for your depression and make sure you know about any interactions.
但是最好询问医生，这些对于你是否是治愈抑郁最好的药物，并确认了解药物之间的相互作用。
Maybe it'll never be right for your company, but you won't know for sure without giving it a try.
也许它永远都不会适合于您的公司，但是，如果不尝试一下，您就不会确切地知道这一点。
In the real world, although you might guess, based on the circumstances, whether or not you will meet someone again, you cannot know for sure.
在真实世界里，尽管你可以根据环境猜想是否会再次遇见某人，但是你并不能肯定。
In the real world, although you might guess, based on the circumstances, whether or not you will meet someone again, you cannot know for sure.
在真实世界里，尽管你可以根据环境猜想是否会再次遇见某人，但是你并不能肯定。
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