The trading pair #交易对 refers to the combination of two assets exchanged on the exchange, for example, BTC/USDT means buying or selling BTC with USDT. Each trading pair has a base asset and a quote asset, where the former is the currency to be traded, and the latter is the currency used for pricing. The choice of trading pairs determines the method of price calculation and the type of funds used. Popular coins usually have multiple trading pairs and better liquidity; obscure coins may only support trading with specific mainstream currencies. Understanding trading pairs can help users choose the most suitable trading path, avoid exchange losses or multiple fees, and effectively improve trading efficiency and capital utilization.