虚拟物流是现代物流的发展趋势，虚拟物流组织内部企业整体库存的最优成为亟待解决的问题。
Virtual logistics is the trend of development for modern logistics. The problem of optimum of whole Inventory of enterprises inside the virtual logistics organization should be solved immediately.
不过库存已经降到了1971年以来的最低水平，因此房屋建设很可能会上升，推动整体经济增长。
But inventories have been whittled down to the lowest level since 1971, so construction is likely to rise and contribute to overall growth in the economy.
自危机爆发时起，变化不定的库存水平就一直对整体经济活动造成很大影响。
Fluctuating inventories have been a big influence on overall economic activity since the onset of the crisis.
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