underground thermal pollution

例句：

1. 1. The underground thermal pollution is a majorenvironmental issue in the city.
   地下热污染是该市的主要环境问题。
2. 2. The governmenthas been working on reducing the levels ofunderground thermal pollution.
   政府一直在努力降低地下热污染的水平。
3. 3. The underground thermal pollution poses a significant threat to the health ofthe local population.
   地下热污染对当地居民的健康构成了重大威胁。