air supply

例句：

1. 1. The city has a good airsupply system to ensure the cleanliness ofthe air.
   这个城市有一个良好的空气供应系统，以确保空气的清洁。
2. 2. The government isworking hard to improve the air supply inthe country.
   政府正在努力改善国家的空气质量。
3. 3. Theair supply in this area is very poor, which affects the health of the peopleliving there.
   该地区的空气质量非常差，这影响了那里居民的健康。