graduate,undergraduate,postgraudate分别什么意思?晕了

graduate,undergraduate,postgraudate分别什么意思?晕了 美国大学里的graduate和undergraduate有什么分别 请问graduate和undergraduate有什么不同 undergraduate freshman什么意思 undergraduate什么意思 大学所指的“Undergraduate”和“Graduate”分别是什么意思? Undergraduate school与Graduate school有什么区别? Penn graduate什么意思 graduate什么意思 postgraduate student undergraduate student graduate student post graduate,post-graduate,post-graduated什么意思?词性? Undergraduate Students的意思