emitter barrier

例句：

1. 1. The emitter barrier is designed to prevent the spread of bacteria and viruses in hospitals.
   发射器屏障旨在医院中防止细菌和病毒的传播。
2. 2. The engineers worked tirelessly to build a new emitter barrier that would protect the city from naturaldisasters.
   工程师们不懈努力，建造了一座新的发射器屏障，以保护城市免受自然灾害的侵害。
3. 3. The emitter barrier was designed to improve air quality and reduce pollution levels in the area.
   发射器屏障的设计旨在改善空气质量并降低该地区的污染水平。