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The branch of astronomy that deals with measuring the positions of celestial objects, especially stars. Astrometrists measure parallaxes and proper motions, which allow astronomers to determine the distances and velocities of the stars.
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行业/领域: 餐厅 类别 Fast food ₁
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Happy Meals are meals from McDonald's marketed at children. They first entered the market in 1979. Happy Meals usually consist of a choice of a ...