如果肯尼迪没有被刺杀，今天的美国会大不相同吗？
Would the U.S. be radically different today if Kennedy had not been assassinated?
如果你从英格兰去美国，那你是向西走。
如果这项法律在全美国通过，人们会担心的。
如果你用拇指和其他手指做一个 “OK” 的手势，那就是美国手语中字母 “f”的形状。
If you make an "OK" sign with your thumb and finger, that is the shape for the letter "f" in American sign language.
如果你担心距离问题，这和美国不是一样的问题吗？
If you are worried about distance, isn't that the same problem with the States?
美国人还相信这条道路吗？如果相信，这能够实现吗？
Do Americans still believe in that path, and if they do, is it attainable?
但是，美国人还相信这条道路吗？如果他们相信，这个目标能够实现吗？
But do Americans still believe in that path, and if they do, is it attainable?
如果纯粹的数字能提供任何证据，那么美国的大学就是全世界羡慕的对象。
If sheer numbers provide any proof, America's universities are the envy of the world.
“如果你的公司在美国，”演讲者继续说：“告诉他们你能够完成！
“If your firm is in America, ” the lecturer continued, “tell them you can do it!
如果我是你的话，我会杀死美国人！
如果这是美国人的设计，那么它注定要失败。
如果美国不领导自由事业，那么自由事业就将无所适从。
If America does not lead the cause of freedom, that cause will not be led.
如果美国与中国进行更密切的合作，这种局面就会出现。
And it will if the United States and China work more closely together.
在美国，那人如果不是上帝，就是国父们。
如果美国改革者们怀疑激励的作用，他们应该去瑞典看看。
If American reformers doubt the power of incentives, they should visit Sweden.
如果你计划到美国旅行，一定要非常小心。
If you're planning a trip to the United States, be very careful.
如果美国国会通过价格管制，那么会产生怎样的影响？
So what would happen if America's Congress imposes price regulations?
如果你想，我把他们都送去美国。
如果美国的计划被通过，那它将代替京都议定书。
The US plan, if approved, could replace the existing Kyoto protocol.
如果提案没有通过，会改变美国国内外的环境政策。
If the bill does not pass, it will change environmental politics in America and beyond.
如果美国的情况比“未创记录”的收成更糟糕会发生什么？
But what happens if the U.S. scenario is worse than a “nonrecord” harvest?
如果美国的情况比“未创记录”的收成更糟糕会发生什么？
But what happens if the U.S. scenario is worse than a “nonrecord” harvest?
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