hot air horn

例句：

1. 1.The hot air horn is used to signal for help in emergencies.
   热风喇叭用于在紧急情况下发出求救信号。
2. 2.The hot air horn was the only way to get people's attention during the fire drill.
   热风喇叭是消防演习期间吸引人们注意力的唯一方法。
3. 3.The hot air horn was a common sight at the fairgrounds, where it could be heard from far away.
   热风喇叭在游乐场很常见，从远处就能听到它的声音。