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1.The quaquversal in the center of the galaxy is believed to be the center of gravity.
银河系的中心是一个四旋涡，人们相信它就是重力的中心。
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2. The quaquversal has been studied for its effects on spacecraft navigation.
四旋涡对航天器导航的影响一直是研究的课题。
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3. The quaquversal can cause a significant increase in the gravitational pull of the star.
四旋涡可以显著增加恒星的引力。