To realize virtual reference services, we should create knowledge Banks, utilize virtual reference products, and promote interlibrary cooperation.

要实现虚拟参考服务，必须建立知识库，必须利用虚拟参考产品，必须开展馆际合作。

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These demands amounted to a virtual run on the banks and helped to bring down Bear Stearns and Lehman Brothers.

NEWYORKER: Mastering the Machine

"There are virtual runs on some of the banks ... that are rumored to be in trouble, " said Russ Dallen, a banking analyst at BBO Financial Services in Caracas.

WSJ: Ch��vez Spurs Bank Fears

Banks will seize such virtual assets in case of a default, or renegotiate the terms of a loan if a company misses a launch date, a sales target or an expected follow-on round of venture capital.

FORBES: Going Into Hock