horizon glass
名词 n.
英文释义
名词 n.
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A half-silvered piece of glass mounted in a quadrant or sextant, so that the horizon can be seen at the same time as the reflection of a heavenly body.
— On the morning of August 25, shortly after breaking camp, he looked back with his horizon glass and caught a majestic glimpse of Cabezon Peak […].
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数据来源: Wiktionary