Futures will be divided into several contracts in a year, and there will be a hot contract in each time period, and funds will flood into this contract for trading, while other contracts are either too long or too close to the delivery date, and there is no amount of funds, that is, there is no trading. Just like pulling a river, the more people at both ends, the more lively it is. People with fewer hands at both ends have fewer transactions, so the intraday trend is not smooth.