Virtual world management component introduces scene graph to make an effective maintenance of virtual world database, state update message is used to keep the consistency in virtual world.

虚拟世界管理模块引入场景图分级结构来组织管理虚拟世界的模型数据，通过发送状态更新消息有效的维护了虚拟世界场景的一致性。

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MySQL, an online database firm, holds virtual Christmas parties, at which teams around the world play games and exchange virtual gifts.

MySOL是一家在线数据库公司，每年它都回举办虚拟圣诞派对，全球各地的团队在线游戏并交换虚拟礼物。

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Dr Kelly was inspired to build this model by a rather less benign piece of software an American military database called Virtual World, which is used to carry out intercontinental training exercises.

ECONOMIST: What the surgeon saw . . .