slow astern后退一;慢速后退;慢速倒车
dead astern[水运] 正后方;翻译;后退
astern servomotor倒车油动机
astern guardian倒车保装置;倒车保护装置;倒车保
astern attack[军] 后半球攻击
astern conference东区
astern amplibesom颠倒放大器
astern conaqueductance反向电导
astern beachcomber回归波
ADV(副词) Something that is astern is at the back of a ship or behind the back part. 在船尾; 在尾部的后面 [技术] ['be' ADV]