???? ??? ???? ??? ?? ????. ???? ??? ???? ??? ???? ???? ??? ???? ??? ???? ?? ??? ??? ???? ?? ‘??’? ????? ????. ???? ??? ??? ??? ???? ??? ??? ??? ??? ? ??? ??? ????

1977? ??? CBC??? ??? ??? ‘????’?? ??? ?? ?? ??? ?? ?? ?. ‘?? ?? ???’ ?? ?????? ?? ??? ??? ??? ????.

??????? ??? ??? ??? ??? ???? ???? ????. ??? ??? ???? ??? ‘???’ ???? ??? ???? ??? ? ?? ??? ????? ?.

?? ????? ???? ???? ??? ??? ??? ?? ???, ???? ???? ????? ???? ???. ???? ??(常數(shù))? ????? ??? ??? ??? ??? ??? ???? ????? ?? ??????, ??? ??? ?? ?? ?? ???? ??? ??? ???? ????? ????.

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