前面的節(jié)目我們了解了美國(guó)的學(xué)位制度，今天一起走進(jìn)最高學(xué)位-博士學(xué)位
A PhD usually requires at least 3 years of full-time study after a bachelor's degree. Some people first get a master's degree, other do not. PhD candidates must also pass special examinations and carry out original research. Students present their findings by writing a dissertation, a long pa…