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alidade level /ˈalkəhˌɒl ˈbʌlb/ n

中文：照准仪水准器

中文 · 照准仪水准器Español · nivelador de la alidadaFrançais · nivelle d’alidade
Meaning：Transparent tube that contains liquid and an air bubble; it serves as a guide for positioning the alidade on the vertical axis.
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Theodolite

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