1. Yinyan refers to the banking derivatives business, which mainly deals in various financial derivatives, including options, forward contracts, interest rate swaps and other ways to obtain income or hedge risks. The silver period refers to the banking futures business, mainly by buying and selling various types of futures contracts, such as commodity futures and stock index futures.

2. Yinyan mainly conducts transactions in the OTC market, such as over-the-counter transactions and electronic transactions. The silver period is mainly the business of spot futures trading in the exchange.

3. The national centralized silver transfer service, referred to as silver transfer, refers to the self-service fund transfer service provided by banks and futures companies for futures investors on the basis of the networking of their systems, so as to realize the directional real-time transfer of funds between their bank settlement accounts and futures margin accounts.