Number 的用法?!

ANU College prides itself on the excellence of its teaching staff, with all subjects taught by specialist teachers and academics, a number holding PhD qualifications. 請問這句後面那個 a number holding PhD qualifications. 的那的 a number 指的是? 所有前面說的 specialist teachers and academics, 還是一部份的 specialist teachers and... show more ANU College prides itself on the excellence of its teaching staff, with all subjects taught by specialist teachers and academics, a number holding PhD qualifications.

請問這句後面那個 a number holding PhD qualifications. 的那的 a number 指的是?

所有前面說的 specialist teachers and academics,
還是一部份的 specialist teachers and academics,
還是所有的 academics ,
還是部份的 academics啊?

麻煩了解此句型結構其中 number 一詞之用法的專家為我解惑,謝謝!
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