海关总署：中国5月铁矿砂及其精矿进口9813.1万吨，4月为10313.8万吨。

Group 1 - The core point of the article indicates that China's imports of iron ore and its concentrates in May amounted to 98.13 million tons, a decrease from 103.14 million tons in April [1] Group 2 - The data reflects a month-on-month decline in iron ore imports, suggesting potential shifts in demand or supply chain dynamics within the industry [1]