????:1???sn??:???????

2???????

3??????????

4???????????

5????????100??

??10??10???? (????? ???????????????????)????“???”,??????,??“?????????”????????,???????????,???????300?????,???

???10????????????????

???????,???,??“???????”,???????“???”,?17??21????,?????206????????????????8.4???,?????DNA?????????????,??“???????”?

?????????????????????,???????????????????????,?????????????????????,???????????????????????????????????????,?????????????13.7??,?????????????????;???,?????????????????????65???

???????????????,????“???????????1??”?????“???????????????188”?????????????????,??????;?????????????????;“??2000”?????;“????????????”??????????????????????????????????????????;“????”????20?????

????,?????????10??????18??????????19?????,????????“????? ????????????????????”????????????,???????(???) ?????????????:???????????