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retractable    音标拼音: [ritr'æktəbəl]
a. 可缩回的,伸缩自如的,可取消的

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  • The Pennsylvania State University | Penn State
    Penn State is a Pennsylvania-based, top-ranked public university that educates students worldwide Learn more about Penn State degree programs and research
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    Penn State also ranks 21st among Association of American Universities public institutions and is the top-ranked public university in Pennsylvania Undergraduate program rankings released by U S News include 14 top-25 ratings (three in the top 10) for select programs in engineering and business, among others
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    The path to a Penn State education starts here Learn more about the undergraduate, graduate, professional, and continuing education admission process and apply
  • About Penn State
    As Pennsylvania’s largest public university, Penn State educates nearly 90,000 students each year—including first-generation college students and adult learners Outside the classroom, students have opportunities to round out their education through entrepreneurship, philanthropy, research, internships, and more
  • Penn State World Campus - Degrees, Certificates, and Courses Offered Online
    Earn your Penn State degree online Penn State World Campus offers accredited online college degrees and certificate programs Learn more about our online undergraduate and graduate programs
  • Penn State Campuses | Penn State Locations | Penn State
    In central Pennsylvania close to University Park, Penn State Altoona offers the appeal of a small college with the prestige of a major research university
  • Penn State Undergraduate Admissions
    Explore undergraduate majors, learn about our campuses, and access resources and FAQs around requirements, application process and how to schedule a visit
  • Graduate | Penn State University Bulletin - Pennsylvania State University
    The Graduate Bulletin is Penn State’s comprehensive source for graduate academic information and program requirements Programs are designed to prepare students to assume positions of informed and responsible authority in their fields and to contribute creatively to them
  • Our History | Penn State
    As Pennsylvania's only land-grant university, Penn State has a broad mission of teaching, research, and public service But that mission was not so grandly conceived in 1855, when the Commonwealth chartered it as a college of agricultural science to apply scientific principles to farming





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