这个新模型追踪了海王星轨道外数无数个微小物体的运行轨迹，它可以帮助天文学家计算出其他星系尘埃盘中行星的特性。
The new model, which tracks thousands of tiny particles beyond the orbit of Neptune, could help astronomers work out the properties of planets in other stars' dust disks.
这允许存储库和项目管理员来追踪模型每一个拷贝的状态。
This allows the repository and the model managers to track the status of every copy of the models.
科学家们建立了一个计算机模型去追踪如何才能减少家里床上屋尘螨的数量。
The scientists developed a computer model to track how changes in the home can reduce Numbers of dust mites in beds.
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