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ceiling projector /ˈsiːlɪŋ pɹədʒˈɛktə/ n

中文：云幂灯

中文 · 云幂灯Español · proyector de altura máximaFrançais · projecteur de plafond
Meaning：Spotlight whose point of luminous impact on a cloud serves as a reference for an alidade or theodolite sighting.
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Ceiling height measurer

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