There had been a half century that had passed since any great modern epic or romance epic had even been produced.

在过去的半个世纪中,没有任何伟大的现代史诗或浪漫史诗出现。

耶鲁公开课 - 弥尔顿课程节选

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