在一些模拟场景中，恒星们会沿着一个完整的轨道围绕银河系中心运转。
In some simulations, the stars spread along a full orbit around the galactic center.
模拟工具被叫做合成环境中心。
The simulation tool is called the Synthetic Environment Core.
方法：采用随机、对照、双盲、双模拟、多中心试验设计方法。
METHODS: The trial design was randomized, double blind, double modeling and multiple center.
方法：采用随机、对照、双盲、双模拟、多中心试验设计方法。
METHODS: The trial design was randomized, double blind, double modeling and multiple center.
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