arcing

常见例句

• The sun appears to move in an arc across the sky.
  太陽看起來在天空以弧線運行。
• An early instrument for measuring altitude of celestial bodies, consisting of a90= graduated arc with a movable radius for measuring angles.
  象限儀用來測量天躰緯度的一種早期工具，由一個有90度刻度的圓弧和一個用來測量角度的可移動的半逕搆成
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