网络游戏迷习惯在虚拟世界里为生存而战。
FANS of online games are used to battling for their lives in virtual worlds.
海军陆战队之所以对虚拟球发生兴趣，是因为真实的战斗训练设施相当昂贵，而且经常不可行，尤其在海外的暂时基地里更是滞碍难行。
The marines are interested in the VirtuSphere because real-life combat training facilities are expensive and often impractical, especially at temporary bases overseas.
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