????:1????????????:?????????

2???????????200

3??????????????

4??????

5?????????

?7??19?? (?? ??????)????19???????,??,??????????????????40???

???7????????19???,??????????????????????????????????????51??,?????????????????????,????????????????????2.2?????????????,????

???????????????????????????(Alf Barrios)????????????,????????????,???????

?????????????????,40???,?????4.5?????????,?????????????????2.3?(?????)?

??1987???????????,??????????????????????,??????????????????????

???????,???????????????2025?,????????2500??????????

??(Simon Trott)??????????????,????????,??????????????????????????????????,??“???,??????????????????????”(??) ???????????????:???????????????