outer arc basin 外弧盆地
outer arc ridge 外弧脊
stretched outer arc 拉伸外弧
nonvolcanic outer arc 非火山外弧
outer-arc ridge 外弧脊
outer arc radius 外圆弧半径
outer arc granites 外岛弧花岗岩
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.
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 bright red bowl, or arc, seen in this image traces the outer surface of the dense dust cloud encasing the young stars.
图中可见红色的弧形，它是一层致密气体的外层表面，这层气体则遮盖着那些年轻的恒星。
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