ahead
... ahead正车在前向前提前前进船前方 aheading正车 Ahoi!喂! ...
headway
... headway通航高度正车 headway正车 headwind逆风 ...
ahead running
... ahead running 前进航行 ahead running 前进航行;正车 ahead running 顺车 ...
advancing
... advancing前进 advancing正车 advancing正车的 ...
half speed ahead
full ahead ; full speed ahead ; crash ahead
ahead ignition cam