2 sentences

1. 听到防空警报，大家都迅速躲进了防空洞。

   tīng​dào fáng​kōng jǐng​bào, dà​jiā dōu xùn​sù duǒ jìn le fáng​kōng​dòng.

   Upon hearing the air raid siren, everyone quickly took cover in the air raid shelter.

   Source: Dong Chinese Dictionary

2. 绝不能让这种非法组织成为犯罪分子的防空洞。

   jué bù néng ràng zhè zhǒng fēi​fǎ zǔ​zhī chéng​wéi fàn​zuì fèn​zǐ de fáng​kōng​dòng.

   We must never let such illegal organizations become a safe haven for criminals.

   Source: Dong Chinese Dictionary