重虚圆点四次曲线是很重要的一类高次平面曲线。

Bicircular quartic is a very important classics of higher plane curves.

youdao

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.

youdao

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.

youdao