1. The small room was unventilated and stuffy, making it difficult to breathe. 这间小房间没有通风，空气闷热，让人呼吸困难。
2. Without proper ventilation, the unventilated basement became filled with musty and damp air. 没有适当的通风，这个没有通风设备的地下室充满了发霉潮湿的空气。