退弹门盖 ejection opening cover

退弹杆头 ejector rod head

空包弹助退器 blank-firing adapter-BFA

弹性退让轴承 elastically yielding bearing

退弹机构 [军] discharging mechanism

弹壳退掷 case ejection

弹性退休年龄 flexible retirement age

弹性退休 flexible retirement

弹性退休金制度 Flexible pension system

子弹退壳 Unloading