*Vertices 4
1 "中国沼气" 0.0 0.0 0.0 x_fact 5.035971 y_fact 8.872902
2 "中国给水排水" 0.0 0.0 0.0 x_fact 9.112710 y_fact 49.880096
3 "环境科学" 0.0 0.0 0.0 x_fact 4.796163 y_fact 27.338129
4 "环境污染与防治" 0.0 0.0 0.0 x_fact 10.071942 y_fact 13.908873
*Matrix 
0.000000 0.451331 0.331762 0.608500 
0.451331 0.000000 0.323730 0.540999 
0.331762 0.323730 0.000000 0.856044 
0.608500 0.540999 0.856044 0.000000