Table 2.

Top 50 keywords with high frequencies

WordsTerm frequencyWordsTerm frequency
Water67,087Design12,302
Construction66,488Improve12,179
Urban55,944Control12,127
Road37,952Technology11,916
New37,925Concept11,816
Development36,049Square11,701
Ecological28,855Comprehensive11,665
Park28,282Protection11,597
Project27,752Link10,653
Green27,482Public10,395
Area27,387Drainage10,336
Projects21,906Environmental10,247
District21,042Quality10,221
Build20,430Demonstration10,009
River18,846Accord9,670
System17,556Treatment9,555
Management16,593Garden9,469
National16,147Permeable9,351
Planning16,083Complete9,319
Rainwater15,378Facilities9,166
Promote14,765Million8,929
Environment14,026Housing8,823
China13,830Pipe8,717
Landscape12,821Billion8,674
Building12,411Community8,624
Source: Created by author

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