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

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

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

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

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