316.In 2007 the University of Wisconsin-Madison-one of the top five or so prestigious public universities-graduated 81% of its white students within six years, but only 56% of its blacks.

在2007年，排名第五位左右的著名公立學校之一威斯康星大學麥迪遜分校，六年內白人學生的畢業率是81%，但是黑人學生的畢業率只有56%。

六級詞匯講解:
本句的主干是...the University of Wisconsin-Madison...graduated 81% of its white students..., but only 56% of its blacks。81% of its white students與but only后的56% of its blacks是并列關系。one of the top five or so prestigious public universities是the University of Wisconsin-Madison的同位語。