dì / xià / shì / cháng / shí / jiān / bù / tōng / fēng / kōng / qì / lǐ / yǒu / yì / gǔ / méi / qì

地下室长时间不通风，空气里有一股霉气。

The basement has not been ventilated for a long time, and the air smells moldy.