Irola yerabha esetshenziswa emishinini yokuphrinta nokudaya yokuphrinta, uketshezi oluginqikayo, ukudaya amaphedi, nokuqondisa izindwangu.Ihlukaniswe ngezigaba ezimbili: i-roller esebenzayo kanye ne-passive roller.Ama-roller asebenzayo kanye ne-passive asetshenziswa ndawonye.Ukuqina kwenjoloba yekhava yerola kuphezulu, kunengqondo...
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