factory whistle

英 美
  • 工厂的汽笛
  • factory n.工厂;制造厂
  • whistle n.口哨;汽笛;警笛v.吹口哨;鸣汽笛;呼啸;吹口哨召唤
Noun:
  1. a whistle at a factory that is sounded to announce times for starting or stopping work