?? ????????? ???????????????
????:1?????300?3??????:????
2????????
3???????????
4???sn??
5???100?4????????
???????????????1?????20?????????????? ???(??????)???20?????????,??,??????????????????,????????????,???????
???????????????????????????????,????????????????????????????????????????????,???????????????,????????????????????3??,?????MaRS???????4?????????????,?????????????
?,??????“????????????”???????????????????????????,??????????????????????????????,????????????????????????????,?????????????(?)
??????:??????????