... secondary boiler 备用锅炉 secondary bow 副虹 secondary breakdown 二次击穿 ...
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Rainbows sometimes appear as two concentric bows with the inner one called the primary bow and the outer one the secondary bow.
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。
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