*Vertices 3
1 "环境化学" 0.0 0.0 0.0 x_fact 1.481481 y_fact 30.740741
2 "中国生物防治" 0.0 0.0 0.0 x_fact 0.000000 y_fact 21.481481
3 "农药" 0.0 0.0 0.0 x_fact 11.851852 y_fact 47.777778
*Matrix 
0.000000 0.000000 0.000000 
0.000000 0.000000 0.000000 
0.000000 0.000000 0.000000