枪支管制是美国人长期争论的话题。
Gun control is a subject about which Americans have argued for a long time.
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?
在这篇污衤中，我们将更详细的了解关于美国的空中交通管制系统。
In this article we will examine air traffic control in the United States.
在这篇污衤中，我们将更详细的了解关于美国的空中交通管制系统。
In this article we will examine air traffic control in the United States.
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