此外，在最近的一项研究中，巢穴上游和巢穴入口处的水流速度，上游朝向东南和朝向其他方向的巢穴相似。
Moreover, in a recent study, current speeds upstream of the nest and at the nest entrance were similar for nests upstream facing southeast and those facing in other directions.
蒸汽船不仅速度更快，往上游运送货物的成本也只有以前手推运货船的十分之一。
Steamboats were not only faster but also transported upriver freight for about one-tenth of what it had previously cost on hand-propelled keelboats.
第二个机制——“拉动式”——通过依据下游消耗速度来确定上游工序的生产速度，这种机制也限制了在制品的数量。
The second mechanism, "Pull," also limits WIP by making the production velocity of the upstream process dependent on the downstream consumption velocity.
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