Rú / guǒ / bù / jí / shí / tōng / fēng / shì / nèi / de / yǒu / hài / qì / tǐ / kě / néng / huì / yù / jī如果不及时通风,室内的有害气体可能会郁积。If the room is not ventilated in time, harmful gases may accumulate indoors.