单词：plasma arc
plasma arc的用法和样例：
例句
- Direct metal forming based on plasma arc welding is a novel rapid prototyping process.摘要基于等离子弧焊的直接金属成形方法是一种新型的快速成形工艺。
- A plasma arc loudspeaker or plasma-dynamic loudspeaker is a loudspeaker that creates sound by varying air pressure through a corona discharge or electric arc.等离子弧喇叭，又名等离子动态喇叭，是一种通过电晕放电或电弧改变空气压力发声的喇叭。
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