国民生产总值是半个世纪前制定的，帮助各国建立了衡量经济产出变化的统一方式。

Developed a half-century ago, GNP helped establish a common way among countries of measuring the change in economic output.

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这在半个世纪前本无法实现。

That might not have been true a half century ago.

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但这部法律的初稿在半个世纪前就诞生了。

The first draft was written half a century ago.

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That might not have been true a half century ago.

这在半个世纪前本无法实现。

普林斯顿公开课 - 人性课程节选

A half century before that, Ben Franklin helped to build a hall in Philadelphia and said the top of this hall would be open to a Muslim preacher from Constant and Obal This is the early 18th century in America.

再有半个世纪前，本·富兰克林帮助在费城建立了一座会堂,他说会堂的顶层将向,一位来自Constant和Obal的穆斯林布道者开放,这些都发生在18世纪的美国。

普林斯顿公开课 - 人性课程节选