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optical sight /ˌɒfθɐlmˈɒlədʒi and ˌiːˌɛntˈiː ˈiə/ n

中文：光学瞄准镜

中文 · 光学瞄准镜Español · visorFrançais · viseur
Meaning：Device with an eyepiece that precisely aims the telescope at the target whose angles are to be measured.
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Theodolite

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