国债期货午盘集体下跌，30年期主力合约跌0.20%

Group 1 - The core point of the article indicates that treasury futures experienced a collective decline during the midday session on August 27, with the 30-year main contract dropping by 0.20% [1] - The 10-year main contract saw a decrease of 0.05% [1] - The 5-year and 2-year main contracts both fell by 0.01% [1]