平面机构中虚约束的存在，给制造加工和机构运动分析带来了诸多不便。
Virtual restraint in planar mechanism brings about many problems to machining and mechanism movement analysis.
通过一个统一的控制平面和一个用户友好的网管系统，实现了虚波长通道的建立、释放和恢复等功能。
A unified control plane as well as a friendly network manager runs in the heterogeneous domain to demonstrate establishment, release and recovery of virtual wavelength paths.
深入地探讨了射影平面上虚元素的共轭性，得到了有关虚元素共轭性的几个结论。
The conjugacy of virtual elements on projective plane was deeply discussed in this paper, and a few conclusions on the conjugacy of virtual elements were arrived at.
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