Quasi birth and death(QBD) models of two kinds of reentrant lines are developed with two stations and four buffers for cases where all but the first buffer capacities are assumed to be finite.是什么意思_Quasi birth and death(QBD) models of two kinds of reentrant lines are developed with two stations and four buffers for cases where all but the first buffer capacities are assumed to be finite.在线翻译_英语_读音_用法_例句