Subject + 发出 + Object
The verb 发出 (fāchū) means 'to issue,' 'to send out,' or 'to emit.' It is a compound of 发 (to send) and 出 (out), used when something is released or dispatched, such as a notice, signal, or sound. For example, 发出警报 means 'to issue an alarm.'
学校发出了一条关于考试安排的通知。
Xuéxiào fāchūle yì tiáo guānyú kǎoshì ānpái de tōngzhī.
The school issued a notice about the exam schedule.
火车发出了长长的汽笛声。
Huǒchē fāchūle chángcháng de qìdí shēng.
The train let out a long whistle.
政府发出警告,提醒大家注意防台风。
Zhèngfǔ fāchū jǐnggào, tíxǐng dàjiā zhùyì fáng táifēng.
The government issued a warning, reminding everyone to take precautions against the typhoon.