单词：graduated arc
graduated arc的用法和样例：
例句
- An early instrument for measuring altitude of celestial bodies, consisting of a90= graduated arc with a movable radius for measuring angles.象限仪用来测量天体纬度的一种早期工具，由一个有90度刻度的圆弧和一个用来测量角度的可移动的半径构成
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音乐咖啡厅
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世界名人简介
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英语口语