Is equipped with the metal frame surface becomes the rectangle, only then ring-like, circle ring-like, semicircle ring-like or arc ring-like.
设有的金属格板表面呈矩形、方环形、圆环形、半圆环形或弧环形。
Indonesia sits on the volatile "Ring of Fire," an arc of seismic instability around the Pacific rim.
印尼即坐落在极不稳定的“火山带”上。这条火山带呈弧形，围绕着太平洋周边地区，充满了地质不稳定。
Application of argon arc local strengthen can increase hardness and high-temperature wear resistance of the ring groove.
采用氩弧局部强化可提高环槽的硬度和高温耐磨性。
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