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??? PD - ??? ???. ?????DB, ????DB
‘1?2?’ ?? ??? PD? ‘1?100’ ??? PD? ????? ?? ???.
19? ???? ??? ??? PD? ??? PD? ? ????? ???? ‘??? ??(??)’ ??? ?? ??.
? ???? “‘?????’?? ?? ?? ???, ???, ???, ??? ? ???? ????? 18? ????”? “25? ??? ?? ????”? ???.
?? ? PD? ?? 2? ‘?????-1? 2?’ ?? ? ? ???? ??? ?? ??? ?? ?? ??? ????.
???? ??? ?? mkhan@donga.com