The trading pair #交易对 refers to a combination of two assets used for buying and selling in the financial market, typically represented as A/B, indicating the purchase of asset A with asset B. For example, in the cryptocurrency market, BTC/USDT indicates buying BTC with USDT. Trading pairs are the foundation for asset exchange, and different trading pairs provide various market choices and price discovery mechanisms. Investors use trading pairs for asset allocation, arbitrage, or speculative operations. The types and number of trading pairs offered by exchanges directly impact market liquidity and trading activity.