1. For some futures contracts with a specific maturity date, if they are far away from the maturity date, their liquidity may be affected and trading is relatively difficult. Because these contracts are difficult to find a counterparty to trade before they expire, or they need to pay higher transaction costs.

2. For some active futures contracts, because of their high liquidity, even if futures contracts are long, they can be traded relatively easily. These contracts usually have more participants, which makes the demand for buying and selling in the market more balanced and reduces the difficulty of closing.