集装箱回风温度下降分析：货物未预冷或预冷不足

The return air temperature of the container started working from 0221 on February 22nd, slowly decreasing from 23.6 degrees Celsius until it reached 15 degrees Celsius at 0000 on the 24th. This indicates that the goods were not pre-cooled or not pre-cooled sufficiently before being loaded into the container.