| 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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