The temporal and spatial characteristics of surface water quality in Jiyun river are analyzed based on environmental measurement data.
通过对不同时段和不同监测点环境监测数据的对比分析，研究蓟运河干流地表水质的时空变化特征。
2
Leipian inherits the achievement in the Fanqie phonetic transcription in Jiyun with innovation, showing the progress in language research and lexicography in the Tang and Song Dynasty.