Compared with thrusters, which remain the main method of steering the spacecraft, the effect of the reflecting devices is slight.
与仍然控制宇宙太空船飞行主要手段推进器比较，反射装置功率是微小的。
The main reason is on running gear, steering system and braking systems, and so on.
影响汽车操纵稳定性的主要原因是在行驶系、转向系及制动系等方面。
All the officers and helmsman are familiar with the change-over from the main to the emergency steering system, or vice versa.
所加驾驶员和舵工均熟悉在主操舵系统和应急操舵系统之间的转换，反之亦然。
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