| 释义 |
圆弧 Yuán Hú
基本例句
circular arcarc de circlearc of a circlearccircle arc繁体圓弧圆弧测定器一种用于测定圆弧的仪器An instrument that measures circular arcs.
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An early instrument for measuring altitude of celestial bodies, consisting of a90= graduatedarcwith a movable radius for measuring angles. |