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采用复式行星轮系设计出一种适应性强的指南车。其特点是：不论双轮着陆，还是单轮着陆，均可实现固定的指南方向。
The use of double planetary gear train to design a strong adaptability of the guide car. Its characteristics are: whether it is a two-wheel landing, or a single landing, can achieve a fixed direction of the guide.