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。”
Sure, it's good for your project and your career, but the more you know, the better your chances of solving a related problem.
毫无疑问，教育对您的项目和职业非常有利，但是您知道得越多，解决相关问题的机会就越多。
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。
This is what I know for sure: in order to be truly happy, you must live along with and you have to stand for something larger than yourself.
我可以非常肯定的是为了追求真正的快乐，你必须为了一些更有意义的事而生活。
You will want to know what the most important browser variations to test against are to make sure your application is optimized for your users.
您想知道根据哪些浏览器测试应用程序，以为用户提供更优秀的应用程序。
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。
I'm not sure how much you know about China and how many of you have been to China, but I believe that for most people in Europe, China is both well-known and little-known.
我不知道在座的青年朋友有多少人去过中国，了解中国。但我相信，无论是谁，中国对你们而言都是一个既熟悉又陌生的国家。
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。
Let me emphasize: This is the only time you will ever know for sure that disaster is about to strike!
我要强调一下：灾难的发生是不可预测的，但是灾难恢复测试时间是确定的。
Again, to make sure that everything goes right, ask for appropriate legal advice to ensure that you know what you're doing and the document is in fact legally binding.
再一次，确保每件事都正确，寻求合适的法律建议来保证你知道自己在做什么以及这份文件事实上的合法性。
This is certainly an abbreviated version of each step in the mobile design process so please be sure to leave me a comment below and let me know which area you would like for me to expound upon!
显然这是一个简版的手机应用程序设计过程步骤，请在下面留下你的评论，让我知道你希望我对哪个部分展开进一步阐述！
Do you remember all those years when scientists argued that smoking would kill us but the doubters insisted that we didn't know for sure?
还记得那些年科学家说吸烟会要我们的命而怀疑者却坚持说我们并不肯定、证据没有说服力、科学没有定论么？
Basically, we still don’t know for sure - but the important thing is to find out what you’ve got and what you like.
基本上我们也不是太确定---但是重要的是去发现你有什么和你喜欢什么方式。
"What's critical is not just using the right strategies for your business, but to make sure you have the metrics in place so you know these are the right strategies," she says.
“关键的是不能只为你的企业用正确的策略，而是要确保你有度量到位，使你知道这是正确的策略”，她说。
Do you remember all those years when scientists argued that smoking would kill us but the doubters insisted that we didn't know for sure? That the evidence was inconclusive, the science uncertain?
记得那些年科学家争论说吸烟会致命、但是怀疑者坚持说我们不能肯定这一点吗、证据不确定且科学上也还没有定论吗？
Do you remember all those years when scientists argued that smoking would kill us but the doubters insisted that we didn't know for sure? That the evidence was inconclusive, the science uncertain?
记得那些年科学家争论说吸烟会致命、但是怀疑者坚持说我们不能肯定这一点吗、证据不确定且科学上也还没有定论吗？
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