请以英语修正润色 Except for the power interruptions period mentioned above the supply air temperature was maintained below -23 degrees Celsius during transportation while the return air temperature remained

Except for the power interruption period mentioned above, the supply air temperature was consistently maintained below -23 degrees Celsius during transportation. The return air temperature also remained around the set temperature of -23 degrees Celsius for the majority of the time, except for the period prior to container gate-in at the loading port and after container gate-out at the discharging port.