 First, we use real trading records from  Shanghai Futures Exchange to construct futures trading networks, in which vertices are trading participants, and two vertices have a common edge if the two corresponding investors simultaneously appear in at least one trading record as a purchaser and a seller respectively.
<clarity>  First, we use real trading records from  Shanghai Futures Exchange to construct futures trading networks, in which vertices are trading participants, and two vertices have a common edge if the two corresponding investors simultaneously appear in at least one trading record as a purchaser and a seller respectively.
 First, we use real trading records from Shanghai Futures Exchange to construct futures trading networks, in which nodes are trading participants, and two vertices have a common edge if the two corresponding investors simultaneously appear in at least one trading record as a purchaser and a seller respectively.