twin electric horn

• 双警报器

twin electric horn的用法和样例：

例句

1. In case of danger raise the electric alarm.
   如果有危险就拉响电动警报器。
2. Campana slammed on the train's brake and blasted his air horn.
   坎帕纳猛地扳动火车刹车，拉响了警报器。