nervous - being worried or afraid of what might happen, armrest - the part of a seat in a car, an airplane, etc., that supports your arm, phase - step in a process, unfasten - to make loose, rotation - process of turning around a central point, frightens - causes to become afraid, sphere - a three-dimensional round object, gravity - the force that causes things to fall towards the Earth, reflects - shows an image on a surface,

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