单词 | virtual |
释义 | virtual adj.   1. that is such for practical purposes though not in name or according to strict definition (is the virtual manager of the business; take this as a virtual promise).   2. Optics relating to the points at which rays would meet if produced backwards (virtual focus; virtual image).   3. Mech. relating to an infinitesimal displacement of a point in a system.   4. Computing not physically existing as such but made by software to appear to do so (virtual memory). Derivatives virtuality n. virtually adv. Etymology: ME f. med.L virtualis f. L virtus after LL virtuosus |
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