The higher up the mountain the more difficult becomes survival

摘要

According to Andrew Sutherland of Oxford,writing in the BMJ of 26 August,it used to be thought physiologically impossible to climb Mount Everest with or without supplementary oxygen.It was not until 1953 that Edmund Hillary and Tenzing Norgay showed that with oxygen the summit could be achieved,and in 1978 Reinhold Messner and Peter Habelar managed it without oxygen.