Mu dziko loyendetsa magalimoto ndi zoyendetsa ndege, kasamalidwe ka magetsi kumachitika ngati chinthu chovuta chomwe chimakhudza kugwiritsa ntchito bwino ntchito ndi mphamvu yowononga. Kwa zaka zambiri, mabizinesi afunafuna njira zatsopano zogwiritsira ntchito mafuta, kuchepetsa kutaya zinyalala, komanso kupititsa patsogolo
Werengani zambiri