名词
中文翻译：拱形
同义词：
['circle', 'curve', 'arch']
例句：
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1. The arc of the moon is visible from this vantage point.
从这个观察点可以看到月亮的弧形。
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2. The car's suspension system is designed to absorb bumps and arcs in the road.
汽车的悬挂系统设计用来吸收路面上的凸起和弯曲。
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3. The arc of the river flows gently into the sea.
河流的弧形缓缓流入大海。