return-air condenser

例句：

1. 1. The return-air condenser is crucial for maintaining the cleanliness of the air in the room.
   回气冷凝器对于保持房间内空气的清洁至关重要。
2. 2. The design of this return-air condenser has been optimized to reduce energy consumption.
   这种回气冷凝器的设计和优化，以减少能源消耗。
3. 3. The return-air condenser plays a vital role in the cooling process, helping to maintain a comfortable temperature indoors.
   回气冷凝器在冷却过程中起着至关重要的作用，有助于保持室内舒适的温度。