Rizzo started developing the virtual classroom in 1999 .

rizzo从1999年开始研发虚拟教室。

Hidden from public view , manipur has become a virtual police-state .

淡出了公众的视线，曼尼普尔已成为一个虚拟的警察国家。

Such artificial networks are pieces of software composed of virtual neurons .

这种人工网络由不同的软件组成虚似的神经元。

A virtual replica was recently unveiled in the place of the original .

在这座建筑的原址上，一件事实上的复制品最近已经被揭幕。

Mainland chinese media imposed a virtual news blackout on the demonstration .

中国大陆的媒体对这些游行示威上强加了实质上的新闻管制。