first officer
El primer oficial se ocupó de la descarga.
The first officer handled the unloading.
Al final habló el primer oficial.
In the end, the first officer spoke.
First Officer's Diary.
El primer oficial Morrison llevaba media hora listo.
First Officer Morrison had been ready for half an hour.
El corredor era su primer oficial, Arthur Merlinson.
The courier was his first officer, Arthur Merlinson.
El primer oficial hizo el recuento.
The first officer took the count.