Karel Drbal , an engineer , noticed that an amazing process was going on inside the space of the pyramid .
He made a small pyramid and placed a razor blade into it . To his astonishment , he found it always stayed sharply .
However much he shaved with it , if he put it back in the pyramid , it could cut well again . He also found that food
remained fresher for a longer period of time in pyramid -shaped structures .밑줄친것중 틀린걸 찾으라는데.. 제 생각에는 stayed sharply 인거 같기도하고... 잘 모르겠습니다..
어떤게 틀렸는지 왜 그런지도좀 말씀해 주세요^^;;

그리고 However much he shaved with it , if he put it back in the pyramid , 이게 무슨말인지도 좀 부탁드립니다^^*