美国通用汽车公司表示，尽管在美国面临重重困难，但其在印度的扩展计划已经上了轨道。
U. s. automaker General Motors says its expansion plans are on track in India despite the troubles it faces in the United States.
使用一个框架公约是好的，易于使用，扩展和维护，如轨道。
It is good to use a Framework with conventions, easy to use, extend and well maintained, like Rails.
设计扩展卡尔曼滤波器进行卫星编队轨道状态估计，数学仿真结果验证了这种导航方案和算法的有效性。
The orbit states estimation is achieved through the extended Kalman filters design. The simulation results verify the validity of this navigation method, and show preferable navigation accuracy.
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