警告牌上写着禁止游泳的警告。

Jǐnggào pái shàng xiězhe jìnzhǐ yóuyǒng de jǐnggào.

The warning sign reads "No Swimming."

老师发出警告，要求学生保持安静。

Lǎoshī fāchū jǐnggào, yāoqiú xuéshēng bǎochí ānjìng.

The teacher issued a warning, asking the students to keep quiet.

这个软件在安装时会发出警告信息。

Zhège ruǎnjiàn zài ānzhuāng shí huì fāchū jǐnggào xìnxī.

This software will issue a warning message during installation.