Port engine full astern!

基本解释左车退三!

网络释义

1)Port engine full astern!,左车退三!2)Port engine half astern!,左车退二!3)Port engine slow astern!,左车退一!4)Full astern port!,左退三5)Slow astern port!,左车后退一6)Port engine full ahead!,左车进三!