how to say "大专文凭“呵呵：）

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I remember in USA, college also 4 years

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College Diploma. A little less than a degree.

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大专 = vocational school

大专文凭
Vocational School Diploma

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I think the term for 大专 is junior college, but I'm not sure really.
If it is, then,
a junior college diploma(or certification): 大专文凭、大专毕业证书
have received a junior college education: 受过大专教育；大专学历
a junior college graduate: 大专毕业生

 I don't think a junior college graduate holds a degree.

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Bachelor's degree.