只有美国消防员和维修人员有密码或者特殊的钥匙时，他们才能按按钮加速关门的过程。

Only US firefighters and repairmen can use the buttons to speed up the door-closing process if they have a code or special keys.

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发达国家中只有美国和日本保留着死刑。

In the developed world, only America and, occasionally, Japan still use it.

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中间的绊脚石只有美国。

Only the United States stands in its way.

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It turns out the U.S. and Jamaica are the only two places on Earth now that use the Fahrenheit scale.

事实上现在地球上,只有美国和牙买加这两个国家,还在使用华氏温标。

麻省理工公开课 - 热力学与动力学课程节选

0% That's right. That's the point at which you are getting to the top 10% of the US tax payers.- Yeah And only after that, does the scale increase.

没错，只有美国纳税人的前,才需要捐赠这么多。，-是的,在这之后，捐款率才会增加。

普林斯顿公开课 - 人性课程节选

What's interesting is when--around when I was born the answer in the United States was about half.

但有趣的是…在我出生的时候,会投给黑人的美国人只有一半。

耶鲁公开课 - 心理学导论课程节选