the drawn-out sound of a siren

• 悠长的汽笛声

the drawn-out sound of a siren的用法和样例：

例句

1. We used to hear the train whistle at night.
   过去我们常会在晚上听到火车的汽笛声。
2. The sudden hoot of a whistle broke into my thoughts.
   突然响起的汽笛声打断了我的思路。