改进后所述外弧辊辊身上设有冷却槽，冷却槽呈环形均布在辊身上。
The improved external arc roll body is provided with a cooling groove; the cooling groove is uniformly distributed on the roll body.
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.
铸坯中的大型夹杂物在厚度方向分布不均匀，内弧含量要明显高于外弧含量。
The distribution of large-sized inclusions was non-homogeneous along thickness direction of slab, which contents of inner arc slab were obviously higher than those of outer arc slab.
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