The continuity of a steam whistle is due to the intense rapidity of its sequential "explosions".

汽笛的连续性，是由于它的连续“爆炸”的强烈速度。

youdao

The sound of a steam whistle fell upon a wilderness. At the parting moment immeasurable melancholy and loneliness welled up in my mind.

一声汽笛，跌落在旷野，无限的惆怅与孤独在离别的那一刻，一起涌上心头。

youdao

When the lead crew reached the circular crater that had been gouged in the dirt spur the day before by a steam shovel, the foreman blew on a whistle.

NPR: Excerpt: 'Legends'

Riding through the streets of the Condesa neighbourhood, for example, you encounter roving marimba players and the sweet potato vendor who pushes around a mobile oven with an ear-piercing steam whistle to herald his arrival.

BBC: Cycling the Aztec way