They paint a picture of a world in which individuals, companies, institutions, and governments must deal with two realities, one physical, and one virtual.
他们描绘了这样一个世界：个人、公司、机构和政府必须应对两种现实，一种是物理现实，一种是虚拟现实。
Sites like Facebook hop between the physical and the virtual, encouraging young people to join groups and events that introduce them to new physical realities.
像Facebook这样的网站，穿梭于实体世界和虚拟世界之间，鼓励年轻人加入群体、参与活动，将他们引入到新的实体现实中。
Virtual worlds can be modeled on physical realities.
虚拟现实可以模仿物理现实。
Virtual worlds can be modeled on physical realities.
虚拟现实可以模仿物理现实。
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