two-track pension adjustment system 养恤金双轨调整制
This design is more complex than the other two options since the system will have to track two time intervals.
该设计比其它两个选项更复杂，因为系统将不得不跟踪两个时间区间。
In this experiment we use a stationery system with two identical cameras with parallel axes to track a moving object in three dimensional space.
这个实验，我们用一种用平行轴固定的两台同步摄像机定位系统来跟踪一个三维空间中的移动物体。
Dawn, which launched in September 2007, is on track to become the first spacecraft to orbit two solar system destinations beyond Earth.
2007年9月发射的曙光号一直在成为第一个进入地球之外两个太阳系系统目的地的轨道的路上。
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