不过，如果虚拟设备供应商允许扩展，则必须提供在更新期间维护这些扩展的技术。
However, if the virtual appliance provider allows extensions, they must provide techniques to maintain these extensions during update.
Hutt and Speh(2001)认为这种虚拟商场使公司和供应商能够实时供货，简化了购买过程，降低了成本。
Hutt and Speh (2001) note that such virtual marketplaces enable companies and their suppliers to conduct business in real time as well as simplify purchase processes and cut costs.
蓝色尼罗河采用虚拟模式，它为供应商提供一个虚拟橱窗，而不用冒险投入自己的资金。
Blue Nile adopted a virtual model, in which it provides a shop window for suppliers yet does not put any of its own capital at risk.
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