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唐迪天文钟
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唐迪天文钟
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astrarium of Giovanni Dondi dell'Orologio
唐迪天文钟
由重力机械钟驱动的行星仪,演示了中世纪所认知所有行星(包括太阳和月球)的运动。
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ultramicrochemical manipulation
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ultra microcrystal
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ultramicropalaeontology
ultra microscope
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ultramicroscopic structure
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ultra-Neptunian planet
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ultraparabolic differential equation
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