Deriyên agir cîhê avahiyê di çend beşên agir de dabeş dikin, ji ber vê yekê gava ku agirek di her parçeyek agir de çêbibe, ew nikare heya demek diyarkirî li derve belav bibe, da ku bi bandor agir kontrol bike. Deriyê agir pola xwedan hêza bilind û bandora pêşîlêgirtina agir baş e.

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