arc [ɑ:k]

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n.弧形（物），弧，电弧，弧光

the shape of part of a circle , or other curved line

The sun appears to move in an arc across the sky. 太阳看起来在天空中以弧形运行。
The rainbow described an arc in the dark sky. 彩虹在昏暗的天空划出了一道圆弧。