The Instrument Rating gives the ability to control the aircraft without reference to the ground or horizon, using flight and navigation instruments.
仪表等级赋予飞行员控制飞机的能力，而不用参考地面或地平线，只使用飞行和导航仪表。
In a moving train one feels out of balance, the earth seems to be constantly moving and your mind has only the horizon as a reference, all the others things are constantly in motion.
在一列运动中的火车上，人们感觉不到平衡，大地在不断地移动，在你的脑中只有地平线是参照物，其他所有的东西都在运动。
Thomas suspects that the horizon provides a helpful point of reference, allowing people to sense the difference between their body's natural motion and the motion of the ship.
托马斯猜测地平线给人们提供了一个更有利的参照点，让人们感受到身体自然晃动和船体晃动的差别所在。
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