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7???????????????,????????????“????????????”??,???(???)???,???“?????”?

“?????????????????,?????????????????,??????????????”?????????????,????????????,???,??

????????,??,????????????5??,???????????????30????????“???”??,????????????????20????50???60???,??????????????,?????????????????????“?????????????????????”???

1977???????,??,???????“??”???????????(?????????????)????????,??,?70%?

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????,?????????????????,???????3????????????5??????,???????????;????,8????????10??????“?????????????,???????????????????”

???,?????????,?????????????????????,?????????????????????????????“????,??????????????,????????????????,???”(???) ?????????:?????????