concentric arc
... Add Arcs 增加圆弧 concentric arcs 同心弧 ; 同心圆弧 ARCS AutomatedRingCodeSearch 自动环码检索系统 ...
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同心圆弧 concentric arcs
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彩虹有时会以两条同心圆弧形态出现。内弧称为主虹，外弧称为副虹或霓。
Rainbows sometimes appear as two concentric bows with the inner one called the primary bow and the outer one the secondary bow.
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