1.Hundreds of karst halls have been revealed through engineering construction, cave development for tourism and speleological study, from which a great deal of information have been accumulated.
通过大量的工程实践、旅游洞穴的开发和洞穴的调查研究，揭露了数以百计的岩溶大厅，因而积累了岩溶大厅赋存的众多信息。
2.Hundreds of karst halls have been revealed through engineering construction, cave development for tourism and speleological study, from which a great deal of information have been accumulated.
通过大量的工程实践、旅游洞穴的开发和洞穴的调查研究，揭露了数以百计的岩溶大厅，因而积累了岩溶大厅赋存的众多信息。