短语词组短语retractile drawbridge 拖曳桥locking drawbridge 吊桥锁定装置double drawbridge 双翼仰开桥bobtail drawbridge 截尾仰开桥lever drawbridge 杠杆操纵活动桥Bitan drawbridge 碧潭吊桥old drawbridge 革命年代的吊桥drawbridge coupler 开合桥耦合器 返回 drawbridge