高浓度的一氧化碳。哦,顺便说一下,第三封信上说的炸弹,已经被我安放在了公安局大楼里。”
gāo nóngdù de yīyǎnghuàtàn 。ò ,shùnbiàn shuō yīxià ,dì sān fēng xìn shàng shuō de zhàdán ,yǐjīng bèi wǒ ānfàng zài le gōng\'ānjú dàlóu lǐ 。”
"Thick carbon monoxide. Incidentally, I've already planted the bomb mentioned in the third letter in the police station."