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n.弧,弧线( arc的名词复数 );弧形物; 双语释义:n.(名词)[C]弧,弧形 part of a curved line or circle[C]弧形物 thing with this shape英英释义: arcn.electrical conduction through a gas in an applied electric field同义词:dischargesparkelectric arcelectric dischargea continuous portion of a circ