plasma arc的用法和樣例：
例句
- Direct metal forming based on plasma arc welding is a novel rapid prototyping process.
摘要基於等離子弧焊的直接金屬成形方法是一種新型的快速成形工藝。 - 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.
等離子弧喇叭，又名等離子動態喇叭，是一種通過電暈放電或電弧改變空氣壓力發聲的喇叭。
