求翻译：采煤塌陷区的治理和再利用可以说是一个国际难题，根据城市近郊采煤沉陷区地形高低起伏、部分沉陷区常年或季节性积水、距离城市近等特点，将其开发为具有城市休闲、娱乐、锻炼等服务功能的城市运动绿地，既科学合理，又符合环保和可持续发展的精神。是什么意思？

The governance of the Coal Mining Subsidence District and re-use can be said is an international problem, according to the characteristics of suburban Coal Mining Subsidence terrain ups and downs, part of the subsidence area year-round or seasonal water, from the city will be developed with urban le