如果你不懂实用性的英语，学习吧。
如果你不懂一件事，那就是个坏交易。
如果你不懂英语，我包括它。
如果你不懂这些术语的意思，可以来问我。
If you can't understand the meaning of the terminologies, you can ask me.
如果你不懂，就请提问！
如果你不懂技术术语，你会掉队跟不上的。
If you don't know your technical jargon you're going to be left behind.
如果你不懂我的沉默。
如果你不懂题意，你可以举手让老师重复一遍。
If you do not understand the question, you should raise your hand and ask the teacher to repeat the question.
如果你不懂我的沉默，你将不会明白我的话。
If u don't understand ma silence, then u will not understand ma words.
就仿佛如果你不懂得营销艺术,别人是不会买你的产品的。
You cannot sell your products if you are not marketable enough.
如果你不懂，那我愿意出钱跟你以合理的价钱购入，我的朋友。
Or you aren't, I can pay for this in reasonable price, my friend.
你可能会很成功，但是如果你不懂得与别人分享这一切，这些成功也不会给你带来任何甜蜜的感觉。
You might have all the success in the world, but if you have no one to share it with, then the success you experience will not taste as sweet.
我有一个问题弄不懂，想请教你，你能回答吗？ 汉语用三个分句表达原文的意思，显然效果很好，如果译成：你能回答一个使我弄不懂而又想问你的问题吗？
Can you answer a question which I want to ask and which is puzzling me？
如果你不精通二进制的话，你也许不懂得这是什么意思。
If you are not very fluent in binary, you may have difficult to understand.
如果有乘客听不懂你说的话，你该怎么办？
I: If a passenger can? T understand what you say, what should you do?
全世界都可以不懂，如果你也不懂，我还有什么话可说。
The whole world can not understand, if you do not understand, I have something to say.
如果别人伤害你，而你无动于衷的话，他们将永远不懂得尊重你。
If someone hurt you, and you indifferent, they will never learn to respect you.
如果你听不懂我的悲伤，听懂了怀念也是一样。
If you don't understand my sadness, understand miss also is same.
如果你还是不懂，怎么办？
如果你看不懂这片难以理解的文章，就试着读容易一些的吧。
If you can't understand this difficult article, try reading some simpler ones.
如果你听不懂，那是因为我说的太快了。
如果你继续这样急促不清地说下去，我就听不懂了。
如果你听不懂问题，可以请考官重复一遍。
If you don't understand a question, ask the interviewer to repeat it.
如果你听不懂问题，可以请考官重复一遍。
If you don't understand a question, ask the interviewer to repeat it.
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