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