ventilation with top-and-bottom spaced entries

例句：

1. 1. The new building has a high-tech ventilation system that keepsthe air fresh.
   这座新建筑拥有一个高科技的通风系统，保持空气新鲜。
2. 2.The hospital needs to improve its ventilation system to reduce the spread of viruses.
   医院需要改进其通风系统，以减少病毒的传播。
3. 3. The engineers worked tirelessly to ensure the ventilation systemwas functioning properly.
   工程师们不懈努力，确保通风系统正常工作。