相反，四年制私立大学的学费在过去六年里年均上涨了5.6%。

Instead, private four-year colleges have averaged 5.6% tuition inflation over the past six years.

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Bischoff博士和她的同事在过去六年多总共研究了22只雄鸟。

Altogether, Dr Bischoff and her colleagues studied 22 males over the course of six years.

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在过去六年间，列入调查名单的174个国家中，94%都好歹取得了一些进步。

In the past six years, 94% of the 174 economies surveyed have streamlined at least some processes.

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