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单词 alidade
释义 alidade/ˈælideid/n. Surveying & Astron. a sighting device or pointer for determining directions or measuring angles 【测量学】【天】指方规,照准仪 [French via medieval Latin from Arabic al-ˈiḍɑˉda ‘the revolving radius’, from ˈaḍud ‘upper arm’]
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