他说如果联合国认为有必要，他就支持动用武力。
He says he would support the use of force if the UN deemed it necessary.
如果你有必要的资源，你可以扩展它。
如果我有必要参加考试，这个阶段是我会认真准备考试的时候。
If I have to take exams, this is the stage when I would prepare in earnest for them.
如果我们继续朝着这个目标努力，也许有一天，清单就没有存在的必要了。
And if we keep working toward that goal, someday, perhaps, a list won't be necessary.
如果他们对互联网有更好的理解，他们就会看到确保他们的孩子正确和负责任地使用互联网的必要性。
If they had a better understanding of the Internet, they would see the need to make sure that their children use it properly and responsibly.
如果是由老师指导你的学习以及引导你在线讨论，那么，他们是否有做好这份工作的必要知识就是很重要的事情。
If teachers will be grading your work or leading you in online discussions, it is important that they have the knowledge necessary to do the job.
您可以在用户携带到期会话(实际上是一个新的会话)时捕捉该会话，如果认为有必要，就强制他们重新登录。
You can capture when a user arrives with an expired session (really, a new session) and force them to login again if you think this is necessary.
如果你有兴趣在家试着这么做，没必要向遇到的每个人问候。
If you're inspired to try this at home, there's no need to greet everyone you meet.
因此如果你有双重系统并且合理设计的话，就没必要使用杀虫剂对付那些害虫了。
So if you have a mixed system, and design it very carefully, you don't need to use any pesticides to kill the pests.
但如果你一旦看到他们有可能影响工作就跟老板解释清楚你的麻烦，老板自然会做出必要的调整。
But if you explain that you are having some troubles as soon as you see they are affecting your work, your boss will be able to make the needed adjustments.
如果你感学到长时间疼痛，你有必要让你的医生检查一下。
If you're experiencing chronic pain you might want to check in with your doctor.
问题在于是否有必要制定最新而且更具体的机器人安全规则——如果需要，这些安全规则具体应该怎么写？
The question is whether new, robot-specific safety rules and regulations are needed-and, if so, what they should say.
如果需要移植到其他平台，也许有必要设置dpkg以处理不同版本。
If there were a need for portability to other platforms, it would probably be worth the trouble of setting up DPKG to handle the build.
如果我有必要参加考试，我会在这个阶段认真准备考试。
If I were, this is the stage when I would prepare in earnest for them.
如果他认为有必要尊重过去的传统，去介绍那些听众中的要人，让他们去领受掌声好了。
If he feels compelled to follow recent tradition and introduce some notable figure in the audience, then let them be applauded.
同样地，如果有人买了东西，问你有何看法时，你就没必要告诉他你认为他是在浪费钱，因为这样的实话只有在买东西之前有帮助。
Similarly, if someone buys something and then asks for your opinion, there is no need to tell him that you think he wasted his money. The truth would only have been helpful before the purchase.
如果你有骨质疏松或者牙周疾病的家族史，牙齿检查就更有必要了。
And if you have a family history of osteoporosis or periodontal disease, dental checkups are a must.
如果你的网站在上网用户感兴趣的主题上给他们提供了有价值的东西，那你有必要让全世界都知道。
If your website offers something of worth, valuable to web users interested in that topic, then it behooves you to let the world know about it.
但是如果说有任何必要的好，这些令人沮丧的数据则是一种提醒，警示着人们经济复苏的道路是不平坦的。
But the gloomier figures are a reminder, if any were needed, that the road to recovery is not a smooth one.
有必要。如果实践了书中的技巧，你就能够为改变世界出一份力吗？
Do I believe you can help change the world if you practice the techniques found inside it?
例如，如果由于表空间配置有问题，系统在I/O 方面存在瓶颈，那么减少不必要的代码页转换仍然无济于事。
For example, reducing unnecessary code page conversion is not goign to help if your system is heavily I/O bound due to an unfortunate table space configuration.
这是个冒险的选择但有时很必要——特别是如果其他大多数人都和约翰有问题。
This is a risky option but sometimes it is necessary – especially if most other people share the same problems with John.
所以我们有必要指出，如果金融界由女人来掌管的话，情况应该会有所不同。
So, it is worth pointing out how different things might be if the financial world were female.
对于电费和保险等成本，你有必要与他人一起购买，商谈批量折扣，特别是如果你经营的是一家小公司。
For costs like electricity and insurance, it can pay to pool your buying power with others and negotiate bulk discounts, especially if you run a small business.
如果过去被改变了，是不是说我们有必要会到过去啊？
If the past has been changed, then don't we need to go to the past?
如果评审完毕，有必要的话会出现在一个与工作产品关联的单独的表单上。
If the review results in a sign-off, this is captured on a separate sheet and attached to the work product, if applicable.
如果想通过电话调查提供有效、可靠和有代表性的数据，现在有必要开展移动电话抽样和采访工作。
Sampling and interviewing respondents by cell phone is now a necessity if telephone surveys are to provide valid, reliable and representative data.
如果想通过电话调查提供有效、可靠和有代表性的数据，现在有必要开展移动电话抽样和采访工作。
Sampling and interviewing respondents by cell phone is now a necessity if telephone surveys are to provide valid, reliable and representative data.
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