A year in the life of medical students at the Albert Einstein College of Medicine in the Bronx. Follow the intellectual and emotional journey of a group of medical students at Albert Einstein ...

消化系统(digestive system)由消化道和消化腺两大部分组成。消化道:包括口腔、咽、食道、胃、小肠(十二指肠、空肠、回肠)和大肠(盲肠、阑尾、结肠、直肠、肛门)等部。临床上常把口腔到十二指肠的这一段称上消化道，空肠以下的部分称下消化道。消化腺有小 ...

To help place the ideal ages provided by respondents in context, we compiled data on when in life people around the world actually get married, have their first child and become eligible for certain ...