音乐会上，喇叭发出悠扬的声音。

Yīnyuè huì shàng, lǎbā fāchū yōuyáng de shēngyīn.

At the concert, the trumpet produces a melodious sound.

警察用喇叭提醒行人过马路。

Jǐngchá yòng lǎbā tíxǐng xíngrén guò mǎlù.

The police use the horn to remind pedestrians to cross the road.

汽车喇叭声在城市中回荡。

Qìchē lǎbā shēng zài chéngshì zhōng huídàng.

The sound of car horns echoes in the city.