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 that asset A is purchased with asset B. For example, in the cryptocurrency market, BTC/USDT means purchasing BTC with USDT. Trading pairs are the foundation for asset exchange, and different trading pairs provide various market options 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 affect market liquidity and trading activity.