如果不知道，必须尽快弄清楚。
如果不知道事物的本质，光知道名字有何意义？
What signifies knowing the Names, if you know not the Nature of Things.
如果不知道正确注射，他们会感染的。
They will get infected without knowing how to inject correctly.
如果不知道，那你最好遵循批评并小心翼翼行事。
Hopefully you know the true agenda, but if not, it is always best to follow criticism with caution.
如果不知道不确定度，测量将毫无意义。
A measurement is meaningless without knowing the uncertainties.
SID：如果不知道这一信息，可以向管理员询问。
SID: Get this information from you administrator, if you don't know it.
你知道做什么(如果不知道，请阅读这篇文章)。
如果不知道如何使用更新站点，那么请执行以下步骤。
If you are unsure as to how to use the update site link, follow the steps below.
如果不知道要购买什么，那么为什么要买呢？
If you don't know what you're shopping for then why are you shopping?
Host：如果不知道这一信息，可以向管理员询问。
Host: Get this information from you administrator, if you don't know it.
五年前，如果不知道XML，您就是一只无人重视的丑小鸭。
Five years ago, if you didn't know XML, you were the ugly duckling whom nobody talked to.
如果不知道自己的需求，则难以确定工作何时完成。
If you don't know what you want, it will be difficult to determine whether your work is finished.
PortNumber：如果不知道这一信息，可以向管理员询问。
Port Number: Get this information from you administrator, if you don't know it.
如果不知道类位于哪个jar文件中，可以用以下命令来检查。
If you don't know which jar file the class is in you can check with this command.
如果不知道做哪个，那就都试试，看你喜欢哪一个。没有喜欢的？
If you can't decide which one to do, try them all, see what you like.
知道对方的需求——如果不知道另一半的需要，那还算什么好伴侣？
Know his or her needs--what good is a spouse if he/she does not know the needs of their significant others?
设计一张“喂食计划表”。如果不知道限量，孩子们常常过多地向宠物喂零食。
Work out a treat-feeding schedule. Children tend to overfeed treats if they don't know the limit.
一个人如果不知道失败意味着什么，那么，他就不会懂得成功的价值。
A person doesn't understand the value of success until he realizes what failure means.
假定你已经知道何谓联盟——如果不知道，我先给你做个简单的介绍。
I'm assuming you already know what that is, but if not, let me give you a quick explanation...
如果不知道我客户面临的第一手的问题，我怎么能跟他们谈论这些问题呢？
Without knowing firsthand the issues my clients had to deal with how could I speak to those problems?
许多夫妇需要知道，他们无法想像如果不知道的话，他们接下来的计划是怎么样的。
Many couples need to know. They can't imagine the planning without the knowing.
如果不知道房屋的尺寸、规格以及用途，就开始砌墙和建房间，是很不明智的。
It's not often wise to start putting up walls and creating rooms without knowing the dimensions and specifications and what it's going to be used for.
Molnar说：如果不知道原因，我们就不能进行干预，就不能帮助这些人。
"Without knowing the whys we can't intervene, we can't help these people," Molnar said.
如果不知道某个属性的适当值，可以参考管理控制台的同一页面(请参见图4)。
If you don't know the proper value of an attribute, you can refer to the identical page of the admin console (see Figure 4).
使用GDM 时，如果不知道输入用户名所需的精确键入方法，他们仍然不能够登录。
They still won't be able to log in using GDM without knowing the precise method of typing required when entering your user name.
她不想听Nick多说了，那个电话是匿名人士打的，如果不知道他是谁就没办法盘问他。
She’s not willing to hear more from Nick. The call was from an anonymous source.
如果不知道第一个应用程序连接到哪个ME，则确认消息等待的位置并解决问题将非常费时。
Without knowing which me the first application is connected to, it is extremely time consuming to identify where the message is waiting and hence identify how to resolve the problem.
同样，该服务也会每天问你几个问题，你可以自己回答，或者向朋友请教，当然如果不知道答案你也可以不回答。
You then decide to either answer the question or refer it to another friend. Of course, you can also always pass if you don't know the answer.
如果不知道Eubiq接线板是做什么用的，你可能会以为它是家具的一部分，从某种意义上讲，也确实如此。
If you didn't know what the Eubiq strip was for you'd be forgiven for thinking it was part of the furniture, and in a sense it is.
如果不知道Eubiq接线板是做什么用的，你可能会以为它是家具的一部分，从某种意义上讲，也确实如此。
If you didn't know what the Eubiq strip was for you'd be forgiven for thinking it was part of the furniture, and in a sense it is.
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